31540220032 has 64 divisors (see below), whose sum is σ = 63263664000. Its totient is φ = 15662592000.

The previous prime is 31540220029. The next prime is 31540220069. The reversal of 31540220032 is 23002204513.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 31540219985 and 31540220012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26261032 + ... + 26262232.

It is an arithmetic number, because the mean of its divisors is an integer number (988494750).

Almost surely, 2^31540220032 is an apocalyptic number.

31540220032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31540220032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31631832000).

31540220032 is an abundant number, since it is smaller than the sum of its proper divisors (31723443968).

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

31540220032 is a wasteful number, since it uses less digits than its factorization.

31540220032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445 (or 2433 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 31540220032 its reverse (23002204513), we get a palindrome (54542424545).

The spelling of 31540220032 in words is "thirty-one billion, five hundred forty million, two hundred twenty thousand, thirty-two".