20957267309208 has 64 divisors (see below), whose sum is σ = 52495959859200. Its totient is φ = 6972060103680.

The previous prime is 20957267309189. The next prime is 20957267309221. The reversal of 20957267309208 is 80290376275902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33789553 + ... + 34404191.

It is an arithmetic number, because the mean of its divisors is an integer number (820249372800).

Almost surely, 2^{20957267309208} is an apocalyptic number.

It is an amenable number.

20957267309208 is an abundant number, since it is smaller than the sum of its proper divisors (31538692549992).

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

20957267309208 is a wasteful number, since it uses less digits than its factorization.

20957267309208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617432 (or 617428 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 60.

The spelling of 20957267309208 in words is "twenty trillion, nine hundred fifty-seven billion, two hundred sixty-seven million, three hundred nine thousand, two hundred eight".