1646009020 has 24 divisors (see below), whose sum is σ = 3659950224. Its totient is φ = 619673856.

The previous prime is 1646009017. The next prime is 1646009021. The reversal of 1646009020 is 209006461.

It is a self number, because there is not a number n which added to its sum of digits gives 1646009020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646009021) 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, 2420262 + ... + 2420941.

It is an arithmetic number, because the mean of its divisors is an integer number (152497926).

Almost surely, 2^1646009020 is an apocalyptic number.

1646009020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646009020 is an abundant number, since it is smaller than the sum of its proper divisors (2013941204).

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

1646009020 is a wasteful number, since it uses less digits than its factorization.

1646009020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841229 (or 4841227 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1646009020 is about 40571.0367133994. The cubic root of 1646009020 is about 1180.7122531314.

The spelling of 1646009020 in words is "one billion, six hundred forty-six million, nine thousand, twenty".