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20131345 = 513309713
BaseRepresentation
bin100110011001…
…0111000010001
31101212210000101
41030302320101
520123200340
61555252401
7333053653
oct114627021
941783011
1020131345
11103aaa83
1268aa101
13422b150
1429606d3
151b79c9a
hex1332e11

20131345 has 8 divisors (see below), whose sum is σ = 26015976. Its totient is φ = 14866176.

The previous prime is 20131339. The next prime is 20131373. The reversal of 20131345 is 54313102.

It can be written as a sum of positive squares in 4 ways, for example, as 2289169 + 17842176 = 1513^2 + 4224^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20131345 - 25 = 20131313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154792 + ... + 154921.

It is an arithmetic number, because the mean of its divisors is an integer number (3251997).

Almost surely, 220131345 is an apocalyptic number.

It is an amenable number.

20131345 is a deficient number, since it is larger than the sum of its proper divisors (5884631).

20131345 is a wasteful number, since it uses less digits than its factorization.

20131345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309731.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20131345 is about 4486.7967415518. The cubic root of 20131345 is about 272.0346742488.

Adding to 20131345 its reverse (54313102), we get a palindrome (74444447).

The spelling of 20131345 in words is "twenty million, one hundred thirty-one thousand, three hundred forty-five".

Divisors: 1 5 13 65 309713 1548565 4026269 20131345