20656252512 has 72 divisors (see below), whose sum is σ = 67132827216. Its totient is φ = 5901785856.

The previous prime is 20656252481. The next prime is 20656252531. The reversal of 20656252512 is 21525265602.

20656252512 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 625 + 25 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5121063 + ... + 5125094.

It is an arithmetic number, because the mean of its divisors is an integer number (932400378).

Almost surely, 2^20656252512 is an apocalyptic number.

It is an amenable number.

20656252512 is an abundant number, since it is smaller than the sum of its proper divisors (46476574704).

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

20656252512 is a wasteful number, since it uses less digits than its factorization.

20656252512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10246180 (or 10246169 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 20656252512 in words is "twenty billion, six hundred fifty-six million, two hundred fifty-two thousand, five hundred twelve".