20431532 has 24 divisors (see below), whose sum is σ = 39546192. Its totient is φ = 9158400.

The previous prime is 20431451. The next prime is 20431547. The reversal of 20431532 is 23513402.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32 + ... + 6392.

It is an arithmetic number, because the mean of its divisors is an integer number (1647758).

Almost surely, 2^20431532 is an apocalyptic number.

20431532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20431532 is a deficient number, since it is larger than the sum of its proper divisors (19114660).

20431532 is a wasteful number, since it uses less digits than its factorization.

20431532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6449 (or 6447 counting only the distinct ones).

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

The square root of 20431532 is about 4520.1252195044. The cubic root of 20431532 is about 273.3801499555.

Adding to 20431532 its reverse (23513402), we get a palindrome (43944934).

The spelling of 20431532 in words is "twenty million, four hundred thirty-one thousand, five hundred thirty-two".