20100113 has 4 divisors (see below), whose sum is σ = 21927408. Its totient is φ = 18272820.

The previous prime is 20100097. The next prime is 20100149. The reversal of 20100113 is 31100102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20100113 - 2⁴ = 20100097 is a prime.

It is a super-2 number, since 2×20100113² = 808029085225538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20100113.

It is not an unprimeable number, because it can be changed into a prime (20100713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913631 + ... + 913652.

It is an arithmetic number, because the mean of its divisors is an integer number (5481852).

Almost surely, 2^20100113 is an apocalyptic number.

It is an amenable number.

20100113 is a deficient number, since it is larger than the sum of its proper divisors (1827295).

20100113 is a wasteful number, since it uses less digits than its factorization.

20100113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827294.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20100113 is about 4483.3149565918. The cubic root of 20100113 is about 271.8939221956.

Adding to 20100113 its reverse (31100102), we get a palindrome (51200215).

The spelling of 20100113 in words is "twenty million, one hundred thousand, one hundred thirteen".