20318978 has 32 divisors (see below), whose sum is σ = 33466608. Its totient is φ = 9216000.

The previous prime is 20318971. The next prime is 20318989. The reversal of 20318978 is 87981302.

It can be written as a sum of positive squares in 8 ways, for example, as 12439729 + 7879249 = 3527^2 + 2807^2 .

It is not an unprimeable number, because it can be changed into a prime (20318971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201128 + ... + 201228.

Almost surely, 2^20318978 is an apocalyptic number.

20318978 is a deficient number, since it is larger than the sum of its proper divisors (13147630).

20318978 is a wasteful number, since it uses less digits than its factorization.

20318978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 20318978 is about 4507.6577066144. The cubic root of 20318978 is about 272.8772229874.

The spelling of 20318978 in words is "twenty million, three hundred eighteen thousand, nine hundred seventy-eight".