20907994 has 24 divisors (see below), whose sum is σ = 33918588. Its totient is φ = 9661440.

The previous prime is 20907983. The next prime is 20908001. The reversal of 20907994 is 49970902.

It can be written as a sum of positive squares in 6 ways, for example, as 11526025 + 9381969 = 3395^2 + 3063^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34962 + ... + 35554.

Almost surely, 2^20907994 is an apocalyptic number.

20907994 is a deficient number, since it is larger than the sum of its proper divisors (13010594).

20907994 is a wasteful number, since it uses less digits than its factorization.

20907994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20907994 is about 4572.5259977391. The cubic root of 20907994 is about 275.4889109868.

The spelling of 20907994 in words is "twenty million, nine hundred seven thousand, nine hundred ninety-four".