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20904341 = 182311467
BaseRepresentation
bin100111110111…
…1100110010101
31110100001100212
41033233212111
520322414331
62024015205
7342453413
oct117574625
943301325
1020904341
1110888817
127001505
13443bc43
142ac22b3
151c7dd2b
hex13ef995

20904341 has 4 divisors (see below), whose sum is σ = 20917632. Its totient is φ = 20891052.

The previous prime is 20904337. The next prime is 20904343. The reversal of 20904341 is 14340902.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14340902 = 27170451.

It is a cyclic number.

It is not a de Polignac number, because 20904341 - 22 = 20904337 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20904343) 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, 3911 + ... + 7556.

It is an arithmetic number, because the mean of its divisors is an integer number (5229408).

Almost surely, 220904341 is an apocalyptic number.

It is an amenable number.

20904341 is a deficient number, since it is larger than the sum of its proper divisors (13291).

20904341 is a wasteful number, since it uses less digits than its factorization.

20904341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13290.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20904341 is about 4572.1265293078. The cubic root of 20904341 is about 275.4728657745.

The spelling of 20904341 in words is "twenty million, nine hundred four thousand, three hundred forty-one".

Divisors: 1 1823 11467 20904341