20431432 has 24 divisors (see below), whose sum is σ = 44564310. Its totient is φ = 8756160.

The previous prime is 20431427. The next prime is 20431451. The reversal of 20431432 is 23413402.

It can be written as a sum of positive squares in only one way, i.e., 15476356 + 4955076 = 3934^2 + 2226^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25669 + ... + 26452.

Almost surely, 2^20431432 is an apocalyptic number.

It is an amenable number.

20431432 is an abundant number, since it is smaller than the sum of its proper divisors (24132878).

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

20431432 is a wasteful number, since it uses less digits than its factorization.

20431432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52141 (or 52130 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20431432 is about 4520.1141578504. The cubic root of 20431432 is about 273.3797039446.

Adding to 20431432 its reverse (23413402), we get a palindrome (43844834).

The spelling of 20431432 in words is "twenty million, four hundred thirty-one thousand, four hundred thirty-two".