20021936 has 20 divisors (see below), whose sum is σ = 42319464. Its totient is φ = 9100800.

The previous prime is 20021917. The next prime is 20021951. The reversal of 20021936 is 63912002.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

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, 56705 + ... + 57056.

Almost surely, 2^20021936 is an apocalyptic number.

It is an amenable number.

20021936 is an abundant number, since it is smaller than the sum of its proper divisors (22297528).

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

20021936 is a wasteful number, since it uses less digits than its factorization.

20021936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113780 (or 113774 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20021936 is about 4474.5878022450. The cubic root of 20021936 is about 271.5409645078.

Adding to 20021936 its reverse (63912002), we get a palindrome (83933938).

The spelling of 20021936 in words is "twenty million, twenty-one thousand, nine hundred thirty-six".