20959768 has 16 divisors (see below), whose sum is σ = 39854160. Its totient is φ = 10332000.

The previous prime is 20959711. The next prime is 20959777. The reversal of 20959768 is 86795902.

It is a super-2 number, since 2×20959768² = 878623749227648, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 17883 + ... + 19018.

It is an arithmetic number, because the mean of its divisors is an integer number (2490885).

Almost surely, 2^20959768 is an apocalyptic number.

It is an amenable number.

20959768 is a deficient number, since it is larger than the sum of its proper divisors (18894392).

20959768 is a wasteful number, since it uses less digits than its factorization.

20959768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36978 (or 36974 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20959768 is about 4578.1839194161. The cubic root of 20959768 is about 275.7161192317.

The spelling of 20959768 in words is "twenty million, nine hundred fifty-nine thousand, seven hundred sixty-eight".