1660520 has 16 divisors (see below), whose sum is σ = 3736260. Its totient is φ = 664192.

The previous prime is 1660517. The next prime is 1660553. The reversal of 1660520 is 250661.

It can be written as a sum of positive squares in 2 ways, for example, as 1653796 + 6724 = 1286^2 + 82^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1660492 and 1660501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20717 + ... + 20796.

2^1660520 is an apocalyptic number.

1660520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660520 is an abundant number, since it is smaller than the sum of its proper divisors (2075740).

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

1660520 is a wasteful number, since it uses less digits than its factorization.

1660520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41524 (or 41520 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1660520 is about 1288.6116560081. The cubic root of 1660520 is about 118.4171770185.

The spelling of 1660520 in words is "one million, six hundred sixty thousand, five hundred twenty".