20959836 has 24 divisors (see below), whose sum is σ = 49203840. Its totient is φ = 6944112.

The previous prime is 20959819. The next prime is 20959843. The reversal of 20959836 is 63895902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3226 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (2050160).

Almost surely, 2^20959836 is an apocalyptic number.

It is an amenable number.

20959836 is an abundant number, since it is smaller than the sum of its proper divisors (28244004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20959836 is a wasteful number, since it uses less digits than its factorization.

20959836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10633 (or 10631 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 20959836 is about 4578.1913459356. The cubic root of 20959836 is about 275.7164174009.

Subtracting from 20959836 its product of nonzero digits (116640), we obtain a triangular number (20843196 = T₆₄₅₆).

The spelling of 20959836 in words is "twenty million, nine hundred fifty-nine thousand, eight hundred thirty-six".