31020000420 has 96 divisors (see below), whose sum is σ = 87514922880. Its totient is φ = 8209474560.

The previous prime is 31020000377. The next prime is 31020000491. The reversal of 31020000420 is 2400002013.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31020000396 and 31020000405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4718896 + ... + 4725464.

It is an arithmetic number, because the mean of its divisors is an integer number (911613780).

Almost surely, 2^31020000420 is an apocalyptic number.

31020000420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31020000420 is an abundant number, since it is smaller than the sum of its proper divisors (56494922460).

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

31020000420 is a wasteful number, since it uses less digits than its factorization.

31020000420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7165 (or 7163 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 31020000420 its reverse (2400002013), we get a palindrome (33420002433).

The spelling of 31020000420 in words is "thirty-one billion, twenty million, four hundred twenty", and thus it is an aban number.