1156552020 has 120 divisors (see below), whose sum is σ = 3907305864. Its totient is φ = 284684544.

The previous prime is 1156552013. The next prime is 1156552051. The reversal of 1156552020 is 202556511.

1156552020 is a `hidden beast` number, since 1 + 1 + 5 + 655 + 2 + 0 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2862864 + 1153689156 = 1692^2 + 33966^2 .

It is a super-2 number, since 2×1156552020² = 2675225149932160800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6399 + ... + 48518.

Almost surely, 2^1156552020 is an apocalyptic number.

1156552020 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 1156552020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1953652932).

1156552020 is an abundant number, since it is smaller than the sum of its proper divisors (2750753844).

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

1156552020 is a wasteful number, since it uses less digits than its factorization.

1156552020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54951 (or 54940 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1156552020 is about 34008.1169722759. The cubic root of 1156552020 is about 1049.6754915559.

The spelling of 1156552020 in words is "one billion, one hundred fifty-six million, five hundred fifty-two thousand, twenty".