20431423144 has 16 divisors (see below), whose sum is σ = 41791547520. Its totient is φ = 9287010480.

The previous prime is 20431423127. The next prime is 20431423223. The reversal of 20431423144 is 44132413402.

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, 116087544 + ... + 116087719.

It is an arithmetic number, because the mean of its divisors is an integer number (2611971720).

Almost surely, 2^20431423144 is an apocalyptic number.

It is an amenable number.

20431423144 is an abundant number, since it is smaller than the sum of its proper divisors (21360124376).

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

20431423144 is a wasteful number, since it uses less digits than its factorization.

20431423144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232175280 (or 232175276 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 20431423144 its reverse (44132413402), we get a palindrome (64563836546).

The spelling of 20431423144 in words is "twenty billion, four hundred thirty-one million, four hundred twenty-three thousand, one hundred forty-four".