1660820020 has 24 divisors (see below), whose sum is σ = 3671287200. Its totient is φ = 629363232.

The previous prime is 1660820017. The next prime is 1660820023. The reversal of 1660820020 is 200280661.

It is an interprime number because it is at equal distance from previous prime (1660820017) and next prime (1660820023).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660820023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2184910 + ... + 2185669.

It is an arithmetic number, because the mean of its divisors is an integer number (152970300).

Almost surely, 2^1660820020 is an apocalyptic number.

1660820020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660820020 is an abundant number, since it is smaller than the sum of its proper divisors (2010467180).

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

1660820020 is a wasteful number, since it uses less digits than its factorization.

1660820020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370607 (or 4370605 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1660820020 is about 40753.1596321071. The cubic root of 1660820020 is about 1184.2430839541.

The spelling of 1660820020 in words is "one billion, six hundred sixty million, eight hundred twenty thousand, twenty".