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20895313 = 149140237
BaseRepresentation
bin100111110110…
…1011001010001
31110022120222111
41033231121101
520322122223
62023505321
7342415165
oct117553121
943276874
1020895313
1110881a5a
126bb8241
134437aba
142abcca5
151c7b30d
hex13ed651

20895313 has 4 divisors (see below), whose sum is σ = 21035700. Its totient is φ = 20754928.

The previous prime is 20895289. The next prime is 20895317. The reversal of 20895313 is 31359802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31359802 = 215679901.

It can be written as a sum of positive squares in 2 ways, for example, as 13010449 + 7884864 = 3607^2 + 2808^2 .

It is a cyclic number.

It is not a de Polignac number, because 20895313 - 221 = 18798161 is a prime.

It is a super-2 number, since 2×208953132 = 873228210735938, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20895317) 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, 69970 + ... + 70267.

It is an arithmetic number, because the mean of its divisors is an integer number (5258925).

Almost surely, 220895313 is an apocalyptic number.

It is an amenable number.

20895313 is a deficient number, since it is larger than the sum of its proper divisors (140387).

20895313 is a wasteful number, since it uses less digits than its factorization.

20895313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140386.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20895313 is about 4571.1391359266. The cubic root of 20895313 is about 275.4332037232.

The spelling of 20895313 in words is "twenty million, eight hundred ninety-five thousand, three hundred thirteen".

Divisors: 1 149 140237 20895313