20440131312 has 20 divisors (see below), whose sum is σ = 52803672680. Its totient is φ = 6813377088.

The previous prime is 20440131311. The next prime is 20440131319. The reversal of 20440131312 is 21313104402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440131311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212917987 + ... + 212918082.

It is an arithmetic number, because the mean of its divisors is an integer number (2640183634).

Almost surely, 2^20440131312 is an apocalyptic number.

It is an amenable number.

20440131312 is an abundant number, since it is smaller than the sum of its proper divisors (32363541368).

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

20440131312 is a wasteful number, since it uses less digits than its factorization.

20440131312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425836080 (or 425836074 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20440131312 its reverse (21313104402), we get a palindrome (41753235714).

The spelling of 20440131312 in words is "twenty billion, four hundred forty million, one hundred thirty-one thousand, three hundred twelve".