1156020 has 24 divisors (see below), whose sum is σ = 3237024. Its totient is φ = 308256.

The previous prime is 1156019. The next prime is 1156031. The reversal of 1156020 is 206511.

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

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, 9574 + ... + 9693.

It is an arithmetic number, because the mean of its divisors is an integer number (134876).

2^1156020 is an apocalyptic number.

1156020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156020 is an abundant number, since it is smaller than the sum of its proper divisors (2081004).

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

1156020 is a wasteful number, since it uses less digits than its factorization.

1156020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19279 (or 19277 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1156020 is about 1075.1837052337. The cubic root of 1156020 is about 104.9514514791.

Subtracting from 1156020 its product of nonzero digits (60), we obtain a triangular number (1155960 = T₁₅₂₀).

The spelling of 1156020 in words is "one million, one hundred fifty-six thousand, twenty".