20136431 has 16 divisors (see below), whose sum is σ = 24181248. Its totient is φ = 16394400.

The previous prime is 20136421. The next prime is 20136433. The reversal of 20136431 is 13463102.

It is not a de Polignac number, because 20136431 - 2⁶ = 20136367 is a prime.

It is a super-2 number, since 2×20136431² = 810951706835522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28796 + ... + 29486.

It is an arithmetic number, because the mean of its divisors is an integer number (1511328).

Almost surely, 2^20136431 is an apocalyptic number.

20136431 is a deficient number, since it is larger than the sum of its proper divisors (4044817).

20136431 is a wasteful number, since it uses less digits than its factorization.

20136431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

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

The square root of 20136431 is about 4487.3634798175. The cubic root of 20136431 is about 272.0575813431.

Adding to 20136431 its reverse (13463102), we get a palindrome (33599533).

The spelling of 20136431 in words is "twenty million, one hundred thirty-six thousand, four hundred thirty-one".