20379664 has 10 divisors (see below), whose sum is σ = 39485630. Its totient is φ = 10189824.

The previous prime is 20379649. The next prime is 20379691. The reversal of 20379664 is 46697302.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 57600 = 4508^2 + 240^2 .

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 as a sum of consecutive naturals, namely, 636849 + ... + 636880.

It is an arithmetic number, because the mean of its divisors is an integer number (3948563).

Almost surely, 2^20379664 is an apocalyptic number.

It is an amenable number.

20379664 is a deficient number, since it is larger than the sum of its proper divisors (19105966).

20379664 is a wasteful number, since it uses less digits than its factorization.

20379664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273737 (or 1273731 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 20379664 is about 4514.3841218930. The cubic root of 20379664 is about 273.1486173497.

The spelling of 20379664 in words is "twenty million, three hundred seventy-nine thousand, six hundred sixty-four".