20312578 has 16 divisors (see below), whose sum is σ = 35796096. Its totient is φ = 8522640.

The previous prime is 20312563. The next prime is 20312587. The reversal of 20312578 is 87521302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35226 + ... + 35797.

It is an arithmetic number, because the mean of its divisors is an integer number (2237256).

Almost surely, 2^20312578 is an apocalyptic number.

20312578 is a deficient number, since it is larger than the sum of its proper divisors (15483518).

20312578 is a wasteful number, since it uses less digits than its factorization.

20312578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71049.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20312578 is about 4506.9477476447. The cubic root of 20312578 is about 272.8485700106.

It can be divided in two parts, 203125 and 78, that added together give a triangular number (203203 = T₆₃₇).

The spelling of 20312578 in words is "twenty million, three hundred twelve thousand, five hundred seventy-eight".