20889874536 has 16 divisors (see below), whose sum is σ = 52224686400. Its totient is φ = 6963291504.

The previous prime is 20889874519. The next prime is 20889874543. The reversal of 20889874536 is 63547898802.

It is a self number, because there is not a number n which added to its sum of digits gives 20889874536.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435205696 + ... + 435205743.

It is an arithmetic number, because the mean of its divisors is an integer number (3264042900).

Almost surely, 2^20889874536 is an apocalyptic number.

It is an amenable number.

20889874536 is an abundant number, since it is smaller than the sum of its proper divisors (31334811864).

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

20889874536 is a wasteful number, since it uses less digits than its factorization.

20889874536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870411448 (or 870411444 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 60.

The spelling of 20889874536 in words is "twenty billion, eight hundred eighty-nine million, eight hundred seventy-four thousand, five hundred thirty-six".