138068020 has 24 divisors (see below), whose sum is σ = 294029568. Its totient is φ = 54448800.

The previous prime is 138067987. The next prime is 138068023. The reversal of 138068020 is 20860831.

It is a self number, because there is not a number n which added to its sum of digits gives 138068020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138068023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47196 + ... + 50035.

It is an arithmetic number, because the mean of its divisors is an integer number (12251232).

Almost surely, 2^138068020 is an apocalyptic number.

138068020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138068020 is an abundant number, since it is smaller than the sum of its proper divisors (155961548).

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

138068020 is a wasteful number, since it uses less digits than its factorization.

138068020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97311 (or 97309 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 138068020 is about 11750.2348912692. The cubic root of 138068020 is about 516.8498155180.

The spelling of 138068020 in words is "one hundred thirty-eight million, sixty-eight thousand, twenty".