20000120100 has 144 divisors (see below), whose sum is σ = 61303368000. Its totient is φ = 5020254720.

The previous prime is 20000120093. The next prime is 20000120113. The reversal of 20000120100 is 102100002.

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 883726 + ... + 906074.

Almost surely, 2^20000120100 is an apocalyptic number.

20000120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30651684000).

20000120100 is an abundant number, since it is smaller than the sum of its proper divisors (41303247900).

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

20000120100 is a wasteful number, since it uses less digits than its factorization.

20000120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22542 (or 22535 counting only the distinct ones).

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

Adding to 20000120100 its reverse (102100002), we get a palindrome (20102220102).

The spelling of 20000120100 in words is "twenty billion, one hundred twenty thousand, one hundred".