20313872 has 20 divisors (see below), whose sum is σ = 39534300. Its totient is φ = 10111488.

The previous prime is 20313871. The next prime is 20313913. The reversal of 20313872 is 27831302.

It can be written as a sum of positive squares in 2 ways, for example, as 3041536 + 17272336 = 1744^2 + 4156^2 .

It is not an unprimeable number, because it can be changed into a prime (20313871) 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, 1004 + ... + 6452.

It is an arithmetic number, because the mean of its divisors is an integer number (1976715).

Almost surely, 2^20313872 is an apocalyptic number.

It is an amenable number.

20313872 is a deficient number, since it is larger than the sum of its proper divisors (19220428).

20313872 is a wasteful number, since it uses less digits than its factorization.

20313872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690 (or 5684 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20313872 is about 4507.0913014937. The cubic root of 20313872 is about 272.8543637697.

It can be divided in two parts, 203138 and 72, that multiplied together give a triangular number (14625936 = T₅₄₀₈).

The spelling of 20313872 in words is "twenty million, three hundred thirteen thousand, eight hundred seventy-two".