100020138 has 32 divisors (see below), whose sum is σ = 202694400. Its totient is φ = 32901120.

The previous prime is 100020133. The next prime is 100020149. The reversal of 100020138 is 831020001.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100020131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222538 + ... + 222986.

It is an arithmetic number, because the mean of its divisors is an integer number (6334200).

Almost surely, 2^100020138 is an apocalyptic number.

100020138 is an abundant number, since it is smaller than the sum of its proper divisors (102674262).

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

100020138 is a wasteful number, since it uses less digits than its factorization.

100020138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 100020138 is about 10001.0068493127. The cubic root of 100020138 is about 464.1900387087.

Adding to 100020138 its reverse (831020001), we get a palindrome (931040139).

The spelling of 100020138 in words is "one hundred million, twenty thousand, one hundred thirty-eight".