31420839420 has 72 divisors (see below), whose sum is σ = 96253597440. Its totient is φ = 8295926400.

The previous prime is 31420839397. The next prime is 31420839427. The reversal of 31420839420 is 2493802413.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420839427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845980 + ... + 882339.

It is an arithmetic number, because the mean of its divisors is an integer number (1336855520).

Almost surely, 2^31420839420 is an apocalyptic number.

31420839420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31420839420 is an abundant number, since it is smaller than the sum of its proper divisors (64832758020).

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

31420839420 is a wasteful number, since it uses less digits than its factorization.

31420839420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728435 (or 1728430 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 31420839420 in words is "thirty-one billion, four hundred twenty million, eight hundred thirty-nine thousand, four hundred twenty".