1255205220 has 96 divisors (see below), whose sum is σ = 3705585408. Its totient is φ = 316833792.

The previous prime is 1255205213. The next prime is 1255205239. The reversal of 1255205220 is 225025521.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129172 + ... + 138548.

It is an arithmetic number, because the mean of its divisors is an integer number (38599848).

Almost surely, 2^1255205220 is an apocalyptic number.

1255205220 is a gapful number since it is divisible by the number (10) 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 1255205220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1852792704).

1255205220 is an abundant number, since it is smaller than the sum of its proper divisors (2450380188).

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

1255205220 is a wasteful number, since it uses less digits than its factorization.

1255205220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9509 (or 9507 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 1255205220 is about 35428.8755113678. The cubic root of 1255205220 is about 1078.7105151937.

The spelling of 1255205220 in words is "one billion, two hundred fifty-five million, two hundred five thousand, two hundred twenty".