20890489536 has 84 divisors (see below), whose sum is σ = 68432946192. Its totient is φ = 5968710144.

The previous prime is 20890489483. The next prime is 20890489549. The reversal of 20890489536 is 63598409802.

20890489536 is a `hidden beast` number, since 20 + 8 + 9 + 0 + 4 + 89 + 536 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2586555 + ... + 2594618.

Almost surely, 2^20890489536 is an apocalyptic number.

It is an amenable number.

20890489536 is an abundant number, since it is smaller than the sum of its proper divisors (47542456656).

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

20890489536 is a wasteful number, since it uses less digits than its factorization.

20890489536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181198 (or 5181185 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 20890489536 in words is "twenty billion, eight hundred ninety million, four hundred eighty-nine thousand, five hundred thirty-six".