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20130113 = 76926177
BaseRepresentation
bin100110011001…
…0100101000001
31101212201022202
41030302211001
520123130423
61555242545
7333050243
oct114624501
941781282
1020130113
11103aa063
1268a9455
13422a713
142960093
151b79728
hex1332941

20130113 has 4 divisors (see below), whose sum is σ = 20157060. Its totient is φ = 20103168.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130113 is 31103102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31103102 = 215551551.

It can be written as a sum of positive squares in 2 ways, for example, as 14691889 + 5438224 = 3833^2 + 2332^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130113 - 212 = 20126017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20130094 and 20130103.

It is not an unprimeable number, because it can be changed into a prime (20130163) 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, 12320 + ... + 13857.

It is an arithmetic number, because the mean of its divisors is an integer number (5039265).

Almost surely, 220130113 is an apocalyptic number.

It is an amenable number.

20130113 is a deficient number, since it is larger than the sum of its proper divisors (26947).

20130113 is an equidigital number, since it uses as much as digits as its factorization.

20130113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26946.

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

The square root of 20130113 is about 4486.6594477406. The cubic root of 20130113 is about 272.0291248009.

Adding to 20130113 its reverse (31103102), we get a palindrome (51233215).

The spelling of 20130113 in words is "twenty million, one hundred thirty thousand, one hundred thirteen".

Divisors: 1 769 26177 20130113