20665590492 has 48 divisors (see below), whose sum is σ = 49029611904. Its totient is φ = 6772920000.

The previous prime is 20665590479. The next prime is 20665590493. The reversal of 20665590492 is 29409556602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665590493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2815267 + ... + 2822597.

It is an arithmetic number, because the mean of its divisors is an integer number (1021450248).

Almost surely, 2^20665590492 is an apocalyptic number.

It is an amenable number.

20665590492 is an abundant number, since it is smaller than the sum of its proper divisors (28364021412).

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

20665590492 is a wasteful number, since it uses less digits than its factorization.

20665590492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11250 (or 11248 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 20665590492 in words is "twenty billion, six hundred sixty-five million, five hundred ninety thousand, four hundred ninety-two".