1225255020 has 96 divisors (see below), whose sum is σ = 3751646976. Its totient is φ = 296313600.

The previous prime is 1225255019. The next prime is 1225255039. The reversal of 1225255020 is 205525221.

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, 302247 + ... + 306273.

It is an arithmetic number, because the mean of its divisors is an integer number (39079656).

Almost surely, 2^1225255020 is an apocalyptic number.

1225255020 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 1225255020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875823488).

1225255020 is an abundant number, since it is smaller than the sum of its proper divisors (2526391956).

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

1225255020 is a wasteful number, since it uses less digits than its factorization.

1225255020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4509 counting only the distinct ones).

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

The square root of 1225255020 is about 35003.6429532699. The cubic root of 1225255020 is about 1070.0617252656.

The spelling of 1225255020 in words is "one billion, two hundred twenty-five million, two hundred fifty-five thousand, twenty".