100020100020 has 96 divisors (see below), whose sum is σ = 283027360896. Its totient is φ = 26389440000.

The previous prime is 100020099973. The next prime is 100020100027. The reversal of 100020100020 is 20001020001.

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 = 100020099981 and 100020100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100020100027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10097070 + ... + 10106970.

It is an arithmetic number, because the mean of its divisors is an integer number (2948201676).

Almost surely, 2^100020100020 is an apocalyptic number.

100020100020 is a gapful number since it is divisible by the number (10) 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 100020100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141513680448).

100020100020 is an abundant number, since it is smaller than the sum of its proper divisors (183007260876).

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

100020100020 is a wasteful number, since it uses less digits than its factorization.

100020100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11681 (or 11679 counting only the distinct ones).

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

Adding to 100020100020 its reverse (20001020001), we get a palindrome (120021120021).

The spelling of 100020100020 in words is "one hundred billion, twenty million, one hundred thousand, twenty".