20999590536 has 64 divisors (see below), whose sum is σ = 52890710400. Its totient is φ = 6947712000.

The previous prime is 20999590529. The next prime is 20999590541. The reversal of 20999590536 is 63509599902.

It is a super-5 number, since 5×20999590536⁵ (a number of 53 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8047600 + ... + 8050208.

It is an arithmetic number, because the mean of its divisors is an integer number (826417350).

Almost surely, 2^20999590536 is an apocalyptic number.

It is an amenable number.

20999590536 is an abundant number, since it is smaller than the sum of its proper divisors (31891119864).

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

20999590536 is a wasteful number, since it uses less digits than its factorization.

20999590536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990 (or 4986 counting only the distinct ones).

The product of its (nonzero) digits is 5904900, while the sum is 57.

The spelling of 20999590536 in words is "twenty billion, nine hundred ninety-nine million, five hundred ninety thousand, five hundred thirty-six".