20011100100 has 36 divisors (see below), whose sum is σ = 57898783824. Its totient is φ = 5336293280.

The previous prime is 20011100077. The next prime is 20011100141. The reversal of 20011100100 is 100111002.

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 11 ways as a sum of consecutive naturals, for example, 33351534 + ... + 33352133.

Almost surely, 2^20011100100 is an apocalyptic number.

20011100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011100100 is an abundant number, since it is smaller than the sum of its proper divisors (37887683724).

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

20011100100 is a wasteful number, since it uses less digits than its factorization.

20011100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66703684 (or 66703677 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 20011100100 its reverse (100111002), we get a palindrome (20111211102).

The spelling of 20011100100 in words is "twenty billion, eleven million, one hundred thousand, one hundred".