20857737472 has 72 divisors (see below), whose sum is σ = 48912756480. Its totient is φ = 8751482880.

The previous prime is 20857737451. The next prime is 20857737497. The reversal of 20857737472 is 27473775802.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248272 + ... + 321487.

It is an arithmetic number, because the mean of its divisors is an integer number (679343840).

Almost surely, 2^20857737472 is an apocalyptic number.

20857737472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20857737472 is an abundant number, since it is smaller than the sum of its proper divisors (28055019008).

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

20857737472 is a wasteful number, since it uses less digits than its factorization.

20857737472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569799 (or 569785 counting only the distinct ones).

The product of its (nonzero) digits is 4609920, while the sum is 52.

The spelling of 20857737472 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirty-seven thousand, four hundred seventy-two".