31020143240 has 64 divisors (see below), whose sum is σ = 74523715200. Its totient is φ = 11592548352.

The previous prime is 31020143207. The next prime is 31020143249. The reversal of 31020143240 is 4234102013.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (31020143249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352505 + ... + 431624.

It is an arithmetic number, because the mean of its divisors is an integer number (1164433050).

Almost surely, 2^31020143240 is an apocalyptic number.

It is an amenable number.

31020143240 is an abundant number, since it is smaller than the sum of its proper divisors (43503571960).

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

31020143240 is a wasteful number, since it uses less digits than its factorization.

31020143240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784206 (or 784202 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31020143240 its reverse (4234102013), we get a palindrome (35254245253).

The spelling of 31020143240 in words is "thirty-one billion, twenty million, one hundred forty-three thousand, two hundred forty".