1265570020 has 72 divisors (see below), whose sum is σ = 3139577280. Its totient is φ = 424794240.

The previous prime is 1265570003. The next prime is 1265570051. The reversal of 1265570020 is 200755621.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20161 + ... + 54199.

It is an arithmetic number, because the mean of its divisors is an integer number (43605240).

Almost surely, 2^1265570020 is an apocalyptic number.

1265570020 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 1265570020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569788640).

1265570020 is an abundant number, since it is smaller than the sum of its proper divisors (1874007260).

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

1265570020 is a wasteful number, since it uses less digits than its factorization.

1265570020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34085 (or 34070 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1265570020 is about 35574.8509483877. The cubic root of 1265570020 is about 1081.6715143173.

The spelling of 1265570020 in words is "one billion, two hundred sixty-five million, five hundred seventy thousand, twenty".