20623836 has 12 divisors (see below), whose sum is σ = 48122312. Its totient is φ = 6874608.

The previous prime is 20623829. The next prime is 20623853. The reversal of 20623836 is 63832602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20623836² = 850685222709792, which contains 22 as substring.

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, 859315 + ... + 859338.

Almost surely, 2^20623836 is an apocalyptic number.

It is an amenable number.

20623836 is an abundant number, since it is smaller than the sum of its proper divisors (27498476).

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

20623836 is a wasteful number, since it uses less digits than its factorization.

20623836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718660 (or 1718658 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20623836 is about 4541.3473771558. The cubic root of 20623836 is about 274.2351684823.

It can be divided in two parts, 206 and 23836, that added together give a palindrome (24042).

The spelling of 20623836 in words is "twenty million, six hundred twenty-three thousand, eight hundred thirty-six".