20390936 has 16 divisors (see below), whose sum is σ = 38526840. Its totient is φ = 10117120.

The previous prime is 20390911. The next prime is 20390941. The reversal of 20390936 is 63909302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8681 + ... + 10776.

Almost surely, 2^20390936 is an apocalyptic number.

It is an amenable number.

20390936 is a deficient number, since it is larger than the sum of its proper divisors (18135904).

20390936 is a wasteful number, since it uses less digits than its factorization.

20390936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19594 (or 19590 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 20390936 is about 4515.6324031081. The cubic root of 20390936 is about 273.1989676031.

The spelling of 20390936 in words is "twenty million, three hundred ninety thousand, nine hundred thirty-six".