20957049980 has 24 divisors (see below), whose sum is σ = 44023603680. Its totient is φ = 8380191680.

The previous prime is 20957049977. The next prime is 20957050003. The reversal of 20957049980 is 8994075902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98240 + ... + 227079.

It is an arithmetic number, because the mean of its divisors is an integer number (1834316820).

Almost surely, 2^20957049980 is an apocalyptic number.

20957049980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20957049980 is an abundant number, since it is smaller than the sum of its proper divisors (23066553700).

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

20957049980 is a wasteful number, since it uses less digits than its factorization.

20957049980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328549 (or 328547 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 20957049980 in words is "twenty billion, nine hundred fifty-seven million, forty-nine thousand, nine hundred eighty".