31113232020 has 288 divisors, whose sum is σ = 105142302720. Its totient is φ = 7398743040.

The previous prime is 31113231977. The next prime is 31113232027. The reversal of 31113232020 is 2023231113.

31113232020 is a `hidden beast` number, since 311 + 1 + 32 + 320 + 2 + 0 = 666.

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 = 31113231984 and 31113232002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113232027) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8686630 + ... + 8690210.

It is an arithmetic number, because the mean of its divisors is an integer number (365077440).

Almost surely, 2^31113232020 is an apocalyptic number.

31113232020 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 31113232020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52571151360).

31113232020 is an abundant number, since it is smaller than the sum of its proper divisors (74029070700).

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

31113232020 is a wasteful number, since it uses less digits than its factorization.

31113232020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735 (or 3730 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31113232020 its reverse (2023231113), we get a palindrome (33136463133).

The spelling of 31113232020 in words is "thirty-one billion, one hundred thirteen million, two hundred thirty-two thousand, twenty".