138180020 has 48 divisors (see below), whose sum is σ = 326785536. Its totient is φ = 48624000.

The previous prime is 138180011. The next prime is 138180023. The reversal of 138180020 is 20081831.

138180020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138180023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3311 + ... + 16950.

It is an arithmetic number, because the mean of its divisors is an integer number (6808032).

Almost surely, 2^138180020 is an apocalyptic number.

138180020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138180020 is an abundant number, since it is smaller than the sum of its proper divisors (188605516).

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

138180020 is a wasteful number, since it uses less digits than its factorization.

138180020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20312 (or 20310 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 138180020 is about 11754.9997873245. Note that the first 3 decimals coincide. The cubic root of 138180020 is about 516.9895329650.

The spelling of 138180020 in words is "one hundred thirty-eight million, one hundred eighty thousand, twenty".