31113020 has 48 divisors (see below), whose sum is σ = 68705280. Its totient is φ = 11812416.

The previous prime is 31113011. The next prime is 31113023. The reversal of 31113020 is 2031113.

It is a junction number, because it is equal to n+sod(n) for n = 31112992 and 31113010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109799 + ... + 110081.

It is an arithmetic number, because the mean of its divisors is an integer number (1431360).

Almost surely, 2^31113020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31113020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34352640).

31113020 is an abundant number, since it is smaller than the sum of its proper divisors (37592260).

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

31113020 is a wasteful number, since it uses less digits than its factorization.

31113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31113020 is about 5577.9046244983. The cubic root of 31113020 is about 314.5193644278.

Adding to 31113020 its reverse (2031113), we get a palindrome (33144133).

It can be divided in two parts, 311 and 13020, that added together give a palindrome (13331).

The spelling of 31113020 in words is "thirty-one million, one hundred thirteen thousand, twenty".