20315984 has 20 divisors (see below), whose sum is σ = 42390516. Its totient is φ = 9376512.

The previous prime is 20315917. The next prime is 20316017. The reversal of 20315984 is 48951302.

It can be written as a sum of positive squares in 2 ways, for example, as 10705984 + 9610000 = 3272^2 + 3100^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20315984.

It is a congruent number.

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, 48629 + ... + 49044.

Almost surely, 2^20315984 is an apocalyptic number.

It is an amenable number.

20315984 is an abundant number, since it is smaller than the sum of its proper divisors (22074532).

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

20315984 is a wasteful number, since it uses less digits than its factorization.

20315984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97694 (or 97688 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20315984 is about 4507.3255928544. The cubic root of 20315984 is about 272.8638195158.

The spelling of 20315984 in words is "twenty million, three hundred fifteen thousand, nine hundred eighty-four".