20957049976 has 16 divisors (see below), whose sum is σ = 39298455000. Its totient is φ = 10477461984.

The previous prime is 20957049959. The next prime is 20957049977. The reversal of 20957049976 is 67994075902.

It is a self number, because there is not a number n which added to its sum of digits gives 20957049976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957049977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45726 + ... + 209773.

Almost surely, 2^20957049976 is an apocalyptic number.

It is an amenable number.

20957049976 is a deficient number, since it is larger than the sum of its proper divisors (18341405024).

20957049976 is a wasteful number, since it uses less digits than its factorization.

20957049976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265758 (or 265754 counting only the distinct ones).

The product of its (nonzero) digits is 8573040, while the sum is 58.

The spelling of 20957049976 in words is "twenty billion, nine hundred fifty-seven million, forty-nine thousand, nine hundred seventy-six".