20102009100 has 36 divisors (see below), whose sum is σ = 58161813864. Its totient is φ = 5360535680.

The previous prime is 20102009077. The next prime is 20102009107. The reversal of 20102009100 is 190020102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20102009100.

It is not an unprimeable number, because it can be changed into a prime (20102009107) 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, 33503049 + ... + 33503648.

Almost surely, 2^20102009100 is an apocalyptic number.

20102009100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102009100 is an abundant number, since it is smaller than the sum of its proper divisors (38059804764).

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

20102009100 is a wasteful number, since it uses less digits than its factorization.

20102009100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67006714 (or 67006707 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20102009100 its reverse (190020102), we get a palindrome (20292029202).

The spelling of 20102009100 in words is "twenty billion, one hundred two million, nine thousand, one hundred".