20001100109900 has 72 divisors (see below), whose sum is σ = 53418322779360. Its totient is φ = 6330018493440.

The previous prime is 20001100109897. The next prime is 20001100109923. The reversal of 20001100109900 is 990100110002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1098952445 + ... + 1098970644.

Almost surely, 2^{20001100109900} is an apocalyptic number.

20001100109900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001100109900 is an abundant number, since it is smaller than the sum of its proper divisors (33417222669460).

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

20001100109900 is a wasteful number, since it uses less digits than its factorization.

20001100109900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197923123 (or 2197923116 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 23.

Adding to 20001100109900 its reverse (990100110002), we get a palindrome (20991200219902).

The spelling of 20001100109900 in words is "twenty trillion, one billion, one hundred million, one hundred nine thousand, nine hundred".