20431136 has 24 divisors (see below), whose sum is σ = 43881264. Its totient is φ = 9286720.

The previous prime is 20431123. The next prime is 20431171. The reversal of 20431136 is 63113402.

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, 28670 + ... + 29373.

It is an arithmetic number, because the mean of its divisors is an integer number (1828386).

Almost surely, 2^20431136 is an apocalyptic number.

It is an amenable number.

20431136 is an abundant number, since it is smaller than the sum of its proper divisors (23450128).

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

20431136 is a wasteful number, since it uses less digits than its factorization.

20431136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58064 (or 58056 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20431136 is about 4520.0814151960. The cubic root of 20431136 is about 273.3783837437.

Adding to 20431136 its reverse (63113402), we get a palindrome (83544538).

The spelling of 20431136 in words is "twenty million, four hundred thirty-one thousand, one hundred thirty-six".