20331880 has 16 divisors (see below), whose sum is σ = 45746820. Its totient is φ = 8132736.

The previous prime is 20331853. The next prime is 20331889. The reversal of 20331880 is 8813302.

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 1790244 = 4306^2 + 1338^2 .

It is not an unprimeable number, because it can be changed into a prime (20331889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254109 + ... + 254188.

Almost surely, 2^20331880 is an apocalyptic number.

20331880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20331880 is an abundant number, since it is smaller than the sum of its proper divisors (25414940).

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

20331880 is a wasteful number, since it uses less digits than its factorization.

20331880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508308 (or 508304 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20331880 is about 4509.0885997062. The cubic root of 20331880 is about 272.9349673126.

The spelling of 20331880 in words is "twenty million, three hundred thirty-one thousand, eight hundred eighty".