20665292984 has 32 divisors (see below), whose sum is σ = 45479606880. Its totient is φ = 8617186944.

The previous prime is 20665292971. The next prime is 20665293037. The reversal of 20665292984 is 48929256602.

It is a super-2 number, since 2×20665292984² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 4984727 + ... + 4988870.

It is an arithmetic number, because the mean of its divisors is an integer number (1421237715).

Almost surely, 2^20665292984 is an apocalyptic number.

It is an amenable number.

20665292984 is an abundant number, since it is smaller than the sum of its proper divisors (24814313896).

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

20665292984 is a wasteful number, since it uses less digits than its factorization.

20665292984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973647 (or 9973643 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 20665292984 in words is "twenty billion, six hundred sixty-five million, two hundred ninety-two thousand, nine hundred eighty-four".