20013615972 has 96 divisors (see below), whose sum is σ = 59350314240. Its totient is φ = 5713286400.

The previous prime is 20013615961. The next prime is 20013615989. The reversal of 20013615972 is 27951631002.

20013615972 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 3 + 61 + 597 + 2 = 666.

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

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 31 ways as a sum of consecutive naturals, for example, 924472 + ... + 945872.

It is an arithmetic number, because the mean of its divisors is an integer number (618232440).

Almost surely, 2^20013615972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20013615972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29675157120).

20013615972 is an abundant number, since it is smaller than the sum of its proper divisors (39336698268).

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

20013615972 is a wasteful number, since it uses less digits than its factorization.

20013615972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22658 (or 22650 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 20013615972 in words is "twenty billion, thirteen million, six hundred fifteen thousand, nine hundred seventy-two".