20569999964 has 12 divisors (see below), whose sum is σ = 36327753000. Its totient is φ = 10190641968.

The previous prime is 20569999943. The next prime is 20569999981. The reversal of 20569999964 is 46999996502.

It is a junction number, because it is equal to n+sod(n) for n = 20569999894 and 20569999903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23589014 + ... + 23589885.

It is an arithmetic number, because the mean of its divisors is an integer number (3027312750).

Almost surely, 2^20569999964 is an apocalyptic number.

It is an amenable number.

20569999964 is a deficient number, since it is larger than the sum of its proper divisors (15757753036).

20569999964 is a wasteful number, since it uses less digits than its factorization.

20569999964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47179012 (or 47179010 counting only the distinct ones).

The product of its (nonzero) digits is 85030560, while the sum is 68.

The spelling of 20569999964 in words is "twenty billion, five hundred sixty-nine million, nine hundred ninety-nine thousand, nine hundred sixty-four".