20908992 has 56 divisors (see below), whose sum is σ = 59584336. Its totient is φ = 6432768.

The previous prime is 20908981. The next prime is 20909023. The reversal of 20908992 is 29980902.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 20908992.

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, 1693 + ... + 6684.

It is an arithmetic number, because the mean of its divisors is an integer number (1064006).

Almost surely, 2^20908992 is an apocalyptic number.

It is an amenable number.

20908992 is an abundant number, since it is smaller than the sum of its proper divisors (38675344).

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

20908992 is a wasteful number, since it uses less digits than its factorization.

20908992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8405 (or 8395 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 20908992 is about 4572.6351264889. The cubic root of 20908992 is about 275.4932942155.

The spelling of 20908992 in words is "twenty million, nine hundred eight thousand, nine hundred ninety-two".