20331988 has 12 divisors (see below), whose sum is σ = 35908180. Its totient is φ = 10072512.

The previous prime is 20331967. The next prime is 20331989. The reversal of 20331988 is 88913302.

It can be written as a sum of positive squares in 2 ways, for example, as 9560464 + 10771524 = 3092^2 + 3282^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22881 + ... + 23752.

Almost surely, 2^20331988 is an apocalyptic number.

It is an amenable number.

20331988 is a deficient number, since it is larger than the sum of its proper divisors (15576192).

20331988 is a wasteful number, since it uses less digits than its factorization.

20331988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46746 (or 46744 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20331988 is about 4509.1005755028. The cubic root of 20331988 is about 272.9354505754.

The spelling of 20331988 in words is "twenty million, three hundred thirty-one thousand, nine hundred eighty-eight".