20100020100102 has 24 divisors (see below), whose sum is σ = 43559517308736. Its totient is φ = 6698549198736.

The previous prime is 20100020100047. The next prime is 20100020100103. The reversal of 20100020100102 is 20100102000102.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100020100103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121373398 + ... + 121538889.

It is an arithmetic number, because the mean of its divisors is an integer number (1814979887864).

Almost surely, 2^{20100020100102} is an apocalyptic number.

20100020100102 is an abundant number, since it is smaller than the sum of its proper divisors (23459497208634).

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

20100020100102 is a wasteful number, since it uses less digits than its factorization.

20100020100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242916892 (or 242916889 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20100020100102 its reverse (20100102000102), we get a palindrome (40200122100204).

The spelling of 20100020100102 in words is "twenty trillion, one hundred billion, twenty million, one hundred thousand, one hundred two".