20994738 has 16 divisors (see below), whose sum is σ = 42269376. Its totient is φ = 6951600.

The previous prime is 20994713. The next prime is 20994749. The reversal of 20994738 is 83749902.

It is a self number, because there is not a number n which added to its sum of digits gives 20994738.

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, 10681 + ... + 12492.

It is an arithmetic number, because the mean of its divisors is an integer number (2641836).

Almost surely, 2^20994738 is an apocalyptic number.

20994738 is an abundant number, since it is smaller than the sum of its proper divisors (21274638).

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

20994738 is a wasteful number, since it uses less digits than its factorization.

20994738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23329.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20994738 is about 4582.0015277169. The cubic root of 20994738 is about 275.8693721274.

The spelling of 20994738 in words is "twenty million, nine hundred ninety-four thousand, seven hundred thirty-eight".