20132431240 has 16 divisors (see below), whose sum is σ = 45297970380. Its totient is φ = 8052972480.

The previous prime is 20132431201. The next prime is 20132431309. The reversal of 20132431240 is 4213423102.

It can be written as a sum of positive squares in 2 ways, for example, as 18312043684 + 1820387556 = 135322^2 + 42666^2 .

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, 251655351 + ... + 251655430.

Almost surely, 2^20132431240 is an apocalyptic number.

20132431240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20132431240 is an abundant number, since it is smaller than the sum of its proper divisors (25165539140).

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

20132431240 is a wasteful number, since it uses less digits than its factorization.

20132431240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503310792 (or 503310788 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20132431240 its reverse (4213423102), we get a palindrome (24345854342).

The spelling of 20132431240 in words is "twenty billion, one hundred thirty-two million, four hundred thirty-one thousand, two hundred forty".