20812988 has 12 divisors (see below), whose sum is σ = 41626032. Its totient is φ = 8919840.

The previous prime is 20812973. The next prime is 20812993. The reversal of 20812988 is 88921802.

20812988 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371633 + ... + 371688.

It is an arithmetic number, because the mean of its divisors is an integer number (3468836).

Almost surely, 2^20812988 is an apocalyptic number.

20812988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20812988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20812988 is a wasteful number, since it uses less digits than its factorization.

20812988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743332 (or 743330 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 20812988 is about 4562.1253818807. The cubic root of 20812988 is about 275.0710031535.

The spelling of 20812988 in words is "twenty million, eight hundred twelve thousand, nine hundred eighty-eight".