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23420521 = 191232659
BaseRepresentation
bin101100101010…
…1111001101001
31122001212220201
41121111321221
521443424041
62153552201
7403033255
oct131257151
948055821
1023420521
1112247203
127a15661
134b102c7
143179265
1520c9631
hex1655e69

23420521 has 4 divisors (see below), whose sum is σ = 24653200. Its totient is φ = 22187844.

The previous prime is 23420479. The next prime is 23420533. The reversal of 23420521 is 12502432.

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.

It is a cyclic number.

It is not a de Polignac number, because 23420521 - 213 = 23412329 is a prime.

It is a super-2 number, since 2×234205212 = 1097041607822882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1232659 = 23420521 / (2 + 3 + 4 + 2 + 0 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23420021) 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, 616311 + ... + 616348.

It is an arithmetic number, because the mean of its divisors is an integer number (6163300).

Almost surely, 223420521 is an apocalyptic number.

It is an amenable number.

23420521 is a deficient number, since it is larger than the sum of its proper divisors (1232679).

23420521 is a wasteful number, since it uses less digits than its factorization.

23420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232678.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 23420521 is about 4839.4752814742. The cubic root of 23420521 is about 286.1094377995.

Adding to 23420521 its reverse (12502432), we get a palindrome (35922953).

The spelling of 23420521 in words is "twenty-three million, four hundred twenty thousand, five hundred twenty-one".

Divisors: 1 19 1232659 23420521