20531432 has 16 divisors (see below), whose sum is σ = 38551140. Its totient is φ = 10251136.

The previous prime is 20531431. The next prime is 20531437. The reversal of 20531432 is 23413502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20376196 + 155236 = 4514^2 + 394^2 .

It is not an unprimeable number, because it can be changed into a prime (20531431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6278 + ... + 8970.

Almost surely, 2^20531432 is an apocalyptic number.

It is an amenable number.

20531432 is a deficient number, since it is larger than the sum of its proper divisors (18019708).

20531432 is a wasteful number, since it uses less digits than its factorization.

20531432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652 (or 3648 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20531432 is about 4531.1623232897. The cubic root of 20531432 is about 273.8249899156.

Adding to 20531432 its reverse (23413502), we get a palindrome (43944934).

The spelling of 20531432 in words is "twenty million, five hundred thirty-one thousand, four hundred thirty-two".