1646335020 has 48 divisors (see below), whose sum is σ = 5028807168. Its totient is φ = 399111360.

The previous prime is 1646335013. The next prime is 1646335037. The reversal of 1646335020 is 205336461.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1246564 + ... + 1247883.

It is an arithmetic number, because the mean of its divisors is an integer number (104766816).

Almost surely, 2^1646335020 is an apocalyptic number.

1646335020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646335020 is an abundant number, since it is smaller than the sum of its proper divisors (3382472148).

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

1646335020 is a wasteful number, since it uses less digits than its factorization.

1646335020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494470 (or 2494468 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 1646335020 is about 40575.0541589287. The cubic root of 1646335020 is about 1180.7901965654.

It can be divided in two parts, 164633 and 5020, that added together give a triangular number (169653 = T₅₈₂).

The spelling of 1646335020 in words is "one billion, six hundred forty-six million, three hundred thirty-five thousand, twenty".