20017835380 has 12 divisors (see below), whose sum is σ = 42037454340. Its totient is φ = 8007134144.

The previous prime is 20017835317. The next prime is 20017835381. The reversal of 20017835380 is 8353871002.

It can be written as a sum of positive squares in 2 ways, for example, as 4243480164 + 15774355216 = 65142^2 + 125596^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017835381) by changing a digit.

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, 500445865 + ... + 500445904.

It is an arithmetic number, because the mean of its divisors is an integer number (3503121195).

Almost surely, 2^20017835380 is an apocalyptic number.

20017835380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20017835380 is an abundant number, since it is smaller than the sum of its proper divisors (22019618960).

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

20017835380 is a wasteful number, since it uses less digits than its factorization.

20017835380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000891778 (or 1000891776 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 20017835380 in words is "twenty billion, seventeen million, eight hundred thirty-five thousand, three hundred eighty".