100001200020 has 48 divisors (see below), whose sum is σ = 280417068288. Its totient is φ = 26627585920.

The previous prime is 100001199979. The next prime is 100001200031. The reversal of 100001200020 is 20002100001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 100001199981 and 100001200008.

It is a congruent number.

It is an unprimeable number.

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, 1190316 + ... + 1271555.

It is an arithmetic number, because the mean of its divisors is an integer number (5842022256).

Almost surely, 2^100001200020 is an apocalyptic number.

100001200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100001200020 is an abundant number, since it is smaller than the sum of its proper divisors (180415868268).

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

100001200020 is a wasteful number, since it uses less digits than its factorization.

100001200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462560 (or 2462558 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 100001200020 its reverse (20002100001), we get a palindrome (120003300021).

The spelling of 100001200020 in words is "one hundred billion, one million, two hundred thousand, twenty".