20431132 has 12 divisors (see below), whose sum is σ = 35851480. Its totient is φ = 10187856.

The previous prime is 20431123. The next prime is 20431171. The reversal of 20431132 is 23113402.

It is a happy number.

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, 5223 + ... + 8254.

Almost surely, 2^20431132 is an apocalyptic number.

It is an amenable number.

20431132 is a deficient number, since it is larger than the sum of its proper divisors (15420348).

20431132 is a wasteful number, since it uses less digits than its factorization.

20431132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13860 (or 13858 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20431132 is about 4520.0809727260. The cubic root of 20431132 is about 273.3783659031.

Adding to 20431132 its reverse (23113402), we get a palindrome (43544534).

The spelling of 20431132 in words is "twenty million, four hundred thirty-one thousand, one hundred thirty-two".