20887742568 has 128 divisors (see below), whose sum is σ = 68531328000. Its totient is φ = 5139832320.

The previous prime is 20887742543. The next prime is 20887742609. The reversal of 20887742568 is 86524778802.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262333 + ... + 332556.

It is an arithmetic number, because the mean of its divisors is an integer number (535401000).

Almost surely, 2^20887742568 is an apocalyptic number.

20887742568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20887742568 is an abundant number, since it is smaller than the sum of its proper divisors (47643585432).

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

20887742568 is a wasteful number, since it uses less digits than its factorization.

20887742568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594935 (or 594931 counting only the distinct ones).

The product of its (nonzero) digits is 12042240, while the sum is 57.

The spelling of 20887742568 in words is "twenty billion, eight hundred eighty-seven million, seven hundred forty-two thousand, five hundred sixty-eight".