20515664356 has 12 divisors (see below), whose sum is σ = 39166268400. Its totient is φ = 9325301960.

The previous prime is 20515664353. The next prime is 20515664369. The reversal of 20515664356 is 65346651502.

It is not an unprimeable number, because it can be changed into a prime (20515664353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233132506 + ... + 233132593.

It is an arithmetic number, because the mean of its divisors is an integer number (3263855700).

Almost surely, 2^20515664356 is an apocalyptic number.

It is an amenable number.

20515664356 is a deficient number, since it is larger than the sum of its proper divisors (18650604044).

20515664356 is a wasteful number, since it uses less digits than its factorization.

20515664356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466265114 (or 466265112 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 20515664356 in words is "twenty billion, five hundred fifteen million, six hundred sixty-four thousand, three hundred fifty-six".