20992860 has 72 divisors (see below), whose sum is σ = 72779616. Its totient is φ = 4798080.

The previous prime is 20992843. The next prime is 20992871. The reversal of 20992860 is 6829902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7071 + ... + 9590.

It is an arithmetic number, because the mean of its divisors is an integer number (1010828).

Almost surely, 2^20992860 is an apocalyptic number.

20992860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20992860 is an abundant number, since it is smaller than the sum of its proper divisors (51786756).

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

20992860 is a wasteful number, since it uses less digits than its factorization.

20992860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16683 (or 16678 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20992860 is about 4581.7965908582. The cubic root of 20992860 is about 275.8611462864.

The spelling of 20992860 in words is "twenty million, nine hundred ninety-two thousand, eight hundred sixty".