2531220 has 24 divisors (see below), whose sum is σ = 7087584. Its totient is φ = 674976.

The previous prime is 2531209. The next prime is 2531233. The reversal of 2531220 is 221352.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2531220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21034 + ... + 21153.

It is an arithmetic number, because the mean of its divisors is an integer number (295316).

2^2531220 is an apocalyptic number.

2531220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2531220 is an abundant number, since it is smaller than the sum of its proper divisors (4556364).

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

2531220 is a wasteful number, since it uses less digits than its factorization.

2531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42199 (or 42197 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 2531220 is about 1590.9808295514. The cubic root of 2531220 is about 136.2835060542.

Adding to 2531220 its reverse (221352), we get a palindrome (2752572).

The spelling of 2531220 in words is "two million, five hundred thirty-one thousand, two hundred twenty".