31930241820 has 48 divisors (see below), whose sum is σ = 89489920128. Its totient is φ = 8506612800.

The previous prime is 31930241813. The next prime is 31930241821. The reversal of 31930241820 is 2814203913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31930241821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 190114 + ... + 316233.

It is an arithmetic number, because the mean of its divisors is an integer number (1864373336).

Almost surely, 2^31930241820 is an apocalyptic number.

31930241820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31930241820 is an abundant number, since it is smaller than the sum of its proper divisors (57559678308).

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

31930241820 is a wasteful number, since it uses less digits than its factorization.

31930241820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507410 (or 507408 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 31930241820 in words is "thirty-one billion, nine hundred thirty million, two hundred forty-one thousand, eight hundred twenty".