31243843086820 has 48 divisors (see below), whose sum is σ = 80753317521408. Its totient is φ = 9888161328000.

The previous prime is 31243843086803. The next prime is 31243843086823. The reversal of 31243843086820 is 2868034834213.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (31243843086823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8583471556 + ... + 8583475195.

It is an arithmetic number, because the mean of its divisors is an integer number (1682360781696).

Almost surely, 2^{31243843086820} is an apocalyptic number.

It is an amenable number.

31243843086820 is an abundant number, since it is smaller than the sum of its proper divisors (49509474434588).

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

31243843086820 is a wasteful number, since it uses less digits than its factorization.

31243843086820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17166946780 (or 17166946778 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 52.

The spelling of 31243843086820 in words is "thirty-one trillion, two hundred forty-three billion, eight hundred forty-three million, eighty-six thousand, eight hundred twenty".