18650940020 has 24 divisors (see below), whose sum is σ = 40225542504. Its totient is φ = 7258743936.

The previous prime is 18650940019. The next prime is 18650940053. The reversal of 18650940020 is 2004905681.

It can be written as a sum of positive squares in 4 ways, for example, as 3025440016 + 15625500004 = 55004^2 + 125002^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12601247 + ... + 12602726.

It is an arithmetic number, because the mean of its divisors is an integer number (1676064271).

Almost surely, 2^18650940020 is an apocalyptic number.

18650940020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18650940020 is an abundant number, since it is smaller than the sum of its proper divisors (21574602484).

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

18650940020 is a wasteful number, since it uses less digits than its factorization.

18650940020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25204019 (or 25204017 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 18650940020 in words is "eighteen billion, six hundred fifty million, nine hundred forty thousand, twenty".