20117100 has 36 divisors (see below), whose sum is σ = 58206344. Its totient is φ = 5364480.

The previous prime is 20117099. The next prime is 20117107. The reversal of 20117100 is 171102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (20117107) 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, 33229 + ... + 33828.

Almost surely, 2^20117100 is an apocalyptic number.

20117100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20117100 is an abundant number, since it is smaller than the sum of its proper divisors (38089244).

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

20117100 is a wasteful number, since it uses less digits than its factorization.

20117100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67074 (or 67067 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 20117100 is about 4485.2090252295. The cubic root of 20117100 is about 271.9704949253.

Adding to 20117100 its reverse (171102), we get a palindrome (20288202).

The spelling of 20117100 in words is "twenty million, one hundred seventeen thousand, one hundred".