1620660020 has 48 divisors (see below), whose sum is σ = 3892482048. Its totient is φ = 555240960.

The previous prime is 1620660001. The next prime is 1620660047. The reversal of 1620660020 is 200660261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229340 + ... + 236300.

It is an arithmetic number, because the mean of its divisors is an integer number (81093376).

Almost surely, 2^1620660020 is an apocalyptic number.

1620660020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620660020 is an abundant number, since it is smaller than the sum of its proper divisors (2271822028).

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

1620660020 is a wasteful number, since it uses less digits than its factorization.

1620660020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8640 (or 8638 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1620660020 is about 40257.4219244104. The cubic root of 1620660020 is about 1174.6197701353.

The spelling of 1620660020 in words is "one billion, six hundred twenty million, six hundred sixty thousand, twenty".