20957457267906 has 64 divisors (see below), whose sum is σ = 43649902080000. Its totient is φ = 6704300034432.

The previous prime is 20957457267863. The next prime is 20957457267907. The reversal of 20957457267906 is 60976275475902.

It is a super-2 number, since 2×20957457267906² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20957457267907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1721086 + ... + 6699033.

It is an arithmetic number, because the mean of its divisors is an integer number (682029720000).

Almost surely, 2^{20957457267906} is an apocalyptic number.

20957457267906 is an abundant number, since it is smaller than the sum of its proper divisors (22692444812094).

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

20957457267906 is a wasteful number, since it uses less digits than its factorization.

20957457267906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8420351.

The product of its (nonzero) digits is 400075200, while the sum is 69.

The spelling of 20957457267906 in words is "twenty trillion, nine hundred fifty-seven billion, four hundred fifty-seven million, two hundred sixty-seven thousand, nine hundred six".