20312080 has 20 divisors (see below), whose sum is σ = 47225772. Its totient is φ = 8124800.

The previous prime is 20312077. The next prime is 20312111. The reversal of 20312080 is 8021302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13778944 + 6533136 = 3712^2 + 2556^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 126871 + ... + 127030.

Almost surely, 2^20312080 is an apocalyptic number.

20312080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312080 is an abundant number, since it is smaller than the sum of its proper divisors (26913692).

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

20312080 is a wasteful number, since it uses less digits than its factorization.

20312080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253914 (or 253908 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20312080 is about 4506.8924992726. The cubic root of 20312080 is about 272.8463401984.

Adding to 20312080 its reverse (8021302), we get a palindrome (28333382).

The spelling of 20312080 in words is "twenty million, three hundred twelve thousand, eighty".