20992736 has 12 divisors (see below), whose sum is σ = 41329512. Its totient is φ = 10496352.

The previous prime is 20992711. The next prime is 20992747. The reversal of 20992736 is 63729902.

It is a self number, because there is not a number n which added to its sum of digits gives 20992736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327980 + ... + 328043.

It is an arithmetic number, because the mean of its divisors is an integer number (3444126).

Almost surely, 2^20992736 is an apocalyptic number.

It is an amenable number.

20992736 is a deficient number, since it is larger than the sum of its proper divisors (20336776).

20992736 is an equidigital number, since it uses as much as digits as its factorization.

20992736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656033 (or 656025 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 20992736 is about 4581.7830590284. The cubic root of 20992736 is about 275.8606031359.

The spelling of 20992736 in words is "twenty million, nine hundred ninety-two thousand, seven hundred thirty-six".