2031515220 has 192 divisors, whose sum is σ = 6697506816. Its totient is φ = 450455040.

The previous prime is 2031515179. The next prime is 2031515231. The reversal of 2031515220 is 225151302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3557535 + ... + 3558105.

It is an arithmetic number, because the mean of its divisors is an integer number (34882848).

Almost surely, 2^2031515220 is an apocalyptic number.

2031515220 is a gapful number since it is divisible by the number (20) 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 2031515220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3348753408).

2031515220 is an abundant number, since it is smaller than the sum of its proper divisors (4665991596).

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

2031515220 is a wasteful number, since it uses less digits than its factorization.

2031515220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2031515220 is about 45072.3331989814. Note that the first 3 decimals coincide. The cubic root of 2031515220 is about 1266.5043724045.

Adding to 2031515220 its reverse (225151302), we get a palindrome (2256666522).

The spelling of 2031515220 in words is "two billion, thirty-one million, five hundred fifteen thousand, two hundred twenty".