31020424240 has 80 divisors (see below), whose sum is σ = 78165497088. Its totient is φ = 11380681728.

The previous prime is 31020424217. The next prime is 31020424241. The reversal of 31020424240 is 4242402013.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (31020424241) 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, 68289 + ... + 258271.

Almost surely, 2^31020424240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31020424240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39082748544).

31020424240 is an abundant number, since it is smaller than the sum of its proper divisors (47145072848).

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

31020424240 is a wasteful number, since it uses less digits than its factorization.

31020424240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190166 (or 190160 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 31020424240 its reverse (4242402013), we get a palindrome (35262826253).

The spelling of 31020424240 in words is "thirty-one billion, twenty million, four hundred twenty-four thousand, two hundred forty".