20646374 has 16 divisors (see below), whose sum is σ = 35894016. Its totient is φ = 8723400.

The previous prime is 20646361. The next prime is 20646421. The reversal of 20646374 is 47364602.

It is a self number, because there is not a number n which added to its sum of digits gives 20646374.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9392 + ... + 11379.

It is an arithmetic number, because the mean of its divisors is an integer number (2243376).

Almost surely, 2^20646374 is an apocalyptic number.

20646374 is a deficient number, since it is larger than the sum of its proper divisors (15247642).

20646374 is a wasteful number, since it uses less digits than its factorization.

20646374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20851.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 20646374 is about 4543.8281217493. The cubic root of 20646374 is about 274.3350280516.

The spelling of 20646374 in words is "twenty million, six hundred forty-six thousand, three hundred seventy-four".