20436872 has 16 divisors (see below), whose sum is σ = 38371740. Its totient is φ = 10204416.

The previous prime is 20436863. The next prime is 20436877. The reversal of 20436872 is 27863402.

It can be written as a sum of positive squares in 2 ways, for example, as 16924996 + 3511876 = 4114^2 + 1874^2 .

It is not an unprimeable number, because it can be changed into a prime (20436877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7028 + ... + 9500.

Almost surely, 2^20436872 is an apocalyptic number.

It is an amenable number.

20436872 is a deficient number, since it is larger than the sum of its proper divisors (17934868).

20436872 is a wasteful number, since it uses less digits than its factorization.

20436872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3508 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20436872 is about 4520.7158725140. The cubic root of 20436872 is about 273.4039648255.

The spelling of 20436872 in words is "twenty million, four hundred thirty-six thousand, eight hundred seventy-two".