20971056407 has 12 divisors (see below), whose sum is σ = 24517501200. Its totient is φ = 17884855296.

The previous prime is 20971056389. The next prime is 20971056427. The reversal of 20971056407 is 70465017902.

It is not a de Polignac number, because 20971056407 - 2⁶ = 20971056343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971056427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1065578 + ... + 1085079.

It is an arithmetic number, because the mean of its divisors is an integer number (2043125100).

Almost surely, 2^20971056407 is an apocalyptic number.

20971056407 is a deficient number, since it is larger than the sum of its proper divisors (3546444793).

20971056407 is a wasteful number, since it uses less digits than its factorization.

20971056407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150870 (or 2150863 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 20971056407 in words is "twenty billion, nine hundred seventy-one million, fifty-six thousand, four hundred seven".