20623936 has 14 divisors (see below), whose sum is σ = 40925750. Its totient is φ = 10311936.

The previous prime is 20623931. The next prime is 20623937. The reversal of 20623936 is 63932602.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 553536 = 4480^2 + 744^2 .

It is a super-2 number, since 2×20623936² = 850693472264192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20623898 and 20623907.

It is not an unprimeable number, because it can be changed into a prime (20623931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161061 + ... + 161188.

Almost surely, 2^20623936 is an apocalyptic number.

It is an amenable number.

20623936 is a deficient number, since it is larger than the sum of its proper divisors (20301814).

20623936 is an equidigital number, since it uses as much as digits as its factorization.

20623936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322261 (or 322251 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 20623936 is about 4541.3583870908. The cubic root of 20623936 is about 274.2356117149.

It can be divided in two parts, 206 and 23936, that added together give a palindrome (24142).

The spelling of 20623936 in words is "twenty million, six hundred twenty-three thousand, nine hundred thirty-six".