1669328020 has 12 divisors (see below), whose sum is σ = 3505588884. Its totient is φ = 667731200.

The previous prime is 1669327993. The next prime is 1669328047. The reversal of 1669328020 is 208239661.

It is an interprime number because it is at equal distance from previous prime (1669327993) and next prime (1669328047).

It can be written as a sum of positive squares in 2 ways, for example, as 211004676 + 1458323344 = 14526^2 + 38188^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41733181 + ... + 41733220.

It is an arithmetic number, because the mean of its divisors is an integer number (292132407).

Almost surely, 2^1669328020 is an apocalyptic number.

1669328020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1669328020 is an abundant number, since it is smaller than the sum of its proper divisors (1836260864).

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

1669328020 is a wasteful number, since it uses less digits than its factorization.

1669328020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83466410 (or 83466408 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1669328020 is about 40857.4108332870. The cubic root of 1669328020 is about 1186.2618425476.

The spelling of 1669328020 in words is "one billion, six hundred sixty-nine million, three hundred twenty-eight thousand, twenty".