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20289221 = 31654491
BaseRepresentation
bin100110101100…
…1011011000101
31102011210120122
41031121123011
520143223341
62002511325
7334312151
oct115313305
942153518
1020289221
11104a8657
126965545
134284c74
1429a2061
151bab94b
hex13596c5

20289221 has 4 divisors (see below), whose sum is σ = 20943744. Its totient is φ = 19634700.

The previous prime is 20289193. The next prime is 20289277. The reversal of 20289221 is 12298202.

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 a de Polignac number, because none of the positive numbers 2k-20289221 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 (20289281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327215 + ... + 327276.

It is an arithmetic number, because the mean of its divisors is an integer number (5235936).

Almost surely, 220289221 is an apocalyptic number.

It is an amenable number.

20289221 is a deficient number, since it is larger than the sum of its proper divisors (654523).

20289221 is an equidigital number, since it uses as much as digits as its factorization.

20289221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654522.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20289221 is about 4504.3557807971. The cubic root of 20289221 is about 272.7439489837.

The spelling of 20289221 in words is "twenty million, two hundred eighty-nine thousand, two hundred twenty-one".

Divisors: 1 31 654491 20289221