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20712849 = 367103049
BaseRepresentation
bin100111100000…
…0110110010001
31102222022200120
41033000312101
520300302344
62015540453
7341025213
oct117006621
942868616
1020712849
1110767963
126b2a729
1343a2a31
142a725b3
151c42219
hex13c0d91

20712849 has 8 divisors (see below), whose sum is σ = 28029600. Its totient is φ = 13602336.

The previous prime is 20712847. The next prime is 20712871. The reversal of 20712849 is 94821702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20712849 - 21 = 20712847 is a prime.

It is a super-2 number, since 2×207128492 = 858044227393602, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20712841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51324 + ... + 51725.

It is an arithmetic number, because the mean of its divisors is an integer number (3503700).

Almost surely, 220712849 is an apocalyptic number.

It is an amenable number.

20712849 is a deficient number, since it is larger than the sum of its proper divisors (7316751).

20712849 is a wasteful number, since it uses less digits than its factorization.

20712849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103119.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20712849 is about 4551.1371106571. The cubic root of 20712849 is about 274.6291375487.

The spelling of 20712849 in words is "twenty million, seven hundred twelve thousand, eight hundred forty-nine".

Divisors: 1 3 67 201 103049 309147 6904283 20712849