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20313432 = 23321931479
BaseRepresentation
bin100110101111…
…1010101011000
31102020000210100
41031133111120
520200012212
62003215400
7334442556
oct115372530
942200710
1020313432
1110514867
126977560
134292ca9
1429aabd6
151bb3bdc
hex135f558

20313432 has 96 divisors (see below), whose sum is σ = 59904000. Its totient is φ = 6194880.

The previous prime is 20313421. The next prime is 20313437. The reversal of 20313432 is 23431302.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42169 + ... + 42647.

It is an arithmetic number, because the mean of its divisors is an integer number (624000).

Almost surely, 220313432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20313432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29952000).

20313432 is an abundant number, since it is smaller than the sum of its proper divisors (39590568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20313432 is a wasteful number, since it uses less digits than its factorization.

20313432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20313432 is about 4507.0424892606. The cubic root of 20313432 is about 272.8523937401.

Adding to 20313432 its reverse (23431302), we get a palindrome (43744734).

The spelling of 20313432 in words is "twenty million, three hundred thirteen thousand, four hundred thirty-two".

Divisors: 1 2 3 4 6 8 9 12 18 19 24 31 36 38 57 62 72 76 93 114 124 152 171 186 228 248 279 342 372 456 479 558 589 684 744 958 1116 1178 1368 1437 1767 1916 2232 2356 2874 3534 3832 4311 4712 5301 5748 7068 8622 9101 10602 11496 14136 14849 17244 18202 21204 27303 29698 34488 36404 42408 44547 54606 59396 72808 81909 89094 109212 118792 133641 163818 178188 218424 267282 282131 327636 356376 534564 564262 655272 846393 1069128 1128524 1692786 2257048 2539179 3385572 5078358 6771144 10156716 20313432