31120002023220 has 144 divisors (see below), whose sum is σ = 103033908798912. Its totient is φ = 7540214123520.

The previous prime is 31120002023191. The next prime is 31120002023273. The reversal of 31120002023220 is 2232020002113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31120002023193 and 31120002023202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 487182 + ... + 7904261.

It is an arithmetic number, because the mean of its divisors is an integer number (715513255548).

Almost surely, 2^{31120002023220} is an apocalyptic number.

31120002023220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31120002023220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51516954399456).

31120002023220 is an abundant number, since it is smaller than the sum of its proper divisors (71913906775692).

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

31120002023220 is a wasteful number, since it uses less digits than its factorization.

31120002023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393342 (or 8393337 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31120002023220 its reverse (2232020002113), we get a palindrome (33352022025333).

The spelling of 31120002023220 in words is "thirty-one trillion, one hundred twenty billion, two million, twenty-three thousand, two hundred twenty".