20933988 has 24 divisors (see below), whose sum is σ = 49886592. Its totient is φ = 6829344.

The previous prime is 20933981. The next prime is 20933989. The reversal of 20933988 is 88933902.

It is not an unprimeable number, because it can be changed into a prime (20933981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17995 + ... + 19122.

It is an arithmetic number, because the mean of its divisors is an integer number (2078608).

Almost surely, 2^20933988 is an apocalyptic number.

It is an amenable number.

20933988 is an abundant number, since it is smaller than the sum of its proper divisors (28952604).

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

20933988 is a wasteful number, since it uses less digits than its factorization.

20933988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37171 (or 37169 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 20933988 is about 4575.3675262213. The cubic root of 20933988 is about 275.6030315017.

The spelling of 20933988 in words is "twenty million, nine hundred thirty-three thousand, nine hundred eighty-eight".