31033300020 has 144 divisors (see below), whose sum is σ = 92415774528. Its totient is φ = 7779432960.

The previous prime is 31033300009. The next prime is 31033300021. The reversal of 31033300020 is 2000333013.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31033300021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2831992 + ... + 2842928.

It is an arithmetic number, because the mean of its divisors is an integer number (641776212).

Almost surely, 2^31033300020 is an apocalyptic number.

31033300020 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 31033300020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46207887264).

31033300020 is an abundant number, since it is smaller than the sum of its proper divisors (61382474508).

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

31033300020 is a wasteful number, since it uses less digits than its factorization.

31033300020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118 (or 11097 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 15.

Adding to 31033300020 its reverse (2000333013), we get a palindrome (33033633033).

The spelling of 31033300020 in words is "thirty-one billion, thirty-three million, three hundred thousand, twenty".