20971056406 has 16 divisors (see below), whose sum is σ = 32012236800. Its totient is φ = 10300560808.

The previous prime is 20971056389. The next prime is 20971056427. The reversal of 20971056406 is 60465017902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108051 + ... + 231553.

It is an arithmetic number, because the mean of its divisors is an integer number (2000764800).

Almost surely, 2^20971056406 is an apocalyptic number.

20971056406 is a deficient number, since it is larger than the sum of its proper divisors (11041180394).

20971056406 is a wasteful number, since it uses less digits than its factorization.

20971056406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125003.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 20971056406 in words is "twenty billion, nine hundred seventy-one million, fifty-six thousand, four hundred six".