31540044020 has 12 divisors (see below), whose sum is σ = 66234092484. Its totient is φ = 12616017600.

The previous prime is 31540044017. The next prime is 31540044059. The reversal of 31540044020 is 2044004513.

It can be written as a sum of positive squares in 2 ways, for example, as 15210782224 + 16329261796 = 123332^2 + 127786^2 .

It is a congruent number.

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, 788501081 + ... + 788501120.

It is an arithmetic number, because the mean of its divisors is an integer number (5519507707).

Almost surely, 2^31540044020 is an apocalyptic number.

It is an amenable number.

31540044020 is an abundant number, since it is smaller than the sum of its proper divisors (34694048464).

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

31540044020 is a wasteful number, since it uses less digits than its factorization.

31540044020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577002210 (or 1577002208 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 31540044020 its reverse (2044004513), we get a palindrome (33584048533).

The spelling of 31540044020 in words is "thirty-one billion, five hundred forty million, forty-four thousand, twenty".