100020090 has 32 divisors (see below), whose sum is σ = 240433920. Its totient is φ = 26629184.

The previous prime is 100020023. The next prime is 100020103. The reversal of 100020090 is 90020001.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19252 + ... + 23888.

It is an arithmetic number, because the mean of its divisors is an integer number (7513560).

Almost surely, 2^100020090 is an apocalyptic number.

100020090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100020090 is an abundant number, since it is smaller than the sum of its proper divisors (140413830).

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

100020090 is a wasteful number, since it uses less digits than its factorization.

100020090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 100020090 is about 10001.0044495541. The cubic root of 100020090 is about 464.1899644532.

Adding to 100020090 its reverse (90020001), we get a palindrome (190040091).

The spelling of 100020090 in words is "one hundred million, twenty thousand, ninety".