20310113 has 4 divisors (see below), whose sum is σ = 20458500. Its totient is φ = 20161728.

The previous prime is 20310091. The next prime is 20310119. The reversal of 20310113 is 31101302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8248384 + 12061729 = 2872^2 + 3473^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310113 - 2⁶ = 20310049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310094 and 20310103.

It is not an unprimeable number, because it can be changed into a prime (20310119) 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, 73988 + ... + 74261.

It is an arithmetic number, because the mean of its divisors is an integer number (5114625).

Almost surely, 2^20310113 is an apocalyptic number.

It is an amenable number.

20310113 is a deficient number, since it is larger than the sum of its proper divisors (148387).

20310113 is a wasteful number, since it uses less digits than its factorization.

20310113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148386.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 20310113 is about 4506.6742726760. The cubic root of 20310113 is about 272.8375325320.

Adding to 20310113 its reverse (31101302), we get a palindrome (51411415).

The spelling of 20310113 in words is "twenty million, three hundred ten thousand, one hundred thirteen".