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19928844 = 22321397439
BaseRepresentation
bin100110000000…
…1011100001100
31101111111020100
41030001130030
520100210334
61551051100
7331251405
oct114013414
941444210
1019928844
1110281921
126810a90
134189c20
14290a9ac
151b39c99
hex130170c

19928844 has 72 divisors (see below), whose sum is σ = 54934880. Its totient is φ = 6054912.

The previous prime is 19928837. The next prime is 19928861. The reversal of 19928844 is 44882991.

It is a self number, because there is not a number n which added to its sum of digits gives 19928844.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45177 + ... + 45615.

Almost surely, 219928844 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 19928844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27467440).

19928844 is an abundant number, since it is smaller than the sum of its proper divisors (35006036).

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

19928844 is a wasteful number, since it uses less digits than its factorization.

19928844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 554 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 19928844 is about 4464.1733837296. The cubic root of 19928844 is about 271.1194673039.

The spelling of 19928844 in words is "nineteen million, nine hundred twenty-eight thousand, eight hundred forty-four".

Divisors: 1 2 3 4 6 9 12 13 18 26 36 39 52 78 97 117 156 194 234 291 388 439 468 582 873 878 1164 1261 1317 1746 1756 2522 2634 3492 3783 3951 5044 5268 5707 7566 7902 11349 11414 15132 15804 17121 22698 22828 34242 42583 45396 51363 68484 85166 102726 127749 170332 205452 255498 383247 510996 553579 766494 1107158 1532988 1660737 2214316 3321474 4982211 6642948 9964422 19928844