20999376 has 30 divisors (see below), whose sum is σ = 58769490. Its totient is φ = 6999744.

The previous prime is 20999359. The next prime is 20999383. The reversal of 20999376 is 67399902.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 7160976 = 3720^2 + 2676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72771 + ... + 73058.

It is an arithmetic number, because the mean of its divisors is an integer number (1958983).

Almost surely, 2^20999376 is an apocalyptic number.

It is an amenable number.

20999376 is an abundant number, since it is smaller than the sum of its proper divisors (37770114).

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

20999376 is a wasteful number, since it uses less digits than its factorization.

20999376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145843 (or 145834 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 20999376 is about 4582.5076104683. The cubic root of 20999376 is about 275.8896849623.

The spelling of 20999376 in words is "twenty million, nine hundred ninety-nine thousand, three hundred seventy-six".