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20308321 = 111997169
BaseRepresentation
bin100110101111…
…0000101100001
31102012202210001
41031132011201
520144331241
62003140001
7334421635
oct115360541
942182701
1020308321
1110510a40
126974601
134290877
1429a8dc5
151bb2431
hex135e161

20308321 has 8 divisors (see below), whose sum is σ = 23320800. Its totient is φ = 17490240.

The previous prime is 20308291. The next prime is 20308339. The reversal of 20308321 is 12380302.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20308321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20308361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48376 + ... + 48793.

It is an arithmetic number, because the mean of its divisors is an integer number (2915100).

Almost surely, 220308321 is an apocalyptic number.

It is an amenable number.

20308321 is a deficient number, since it is larger than the sum of its proper divisors (3012479).

20308321 is a wasteful number, since it uses less digits than its factorization.

20308321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97199.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20308321 is about 4506.4754520578. The cubic root of 20308321 is about 272.8295079707.

Adding to 20308321 its reverse (12380302), we get a palindrome (32688623).

The spelling of 20308321 in words is "twenty million, three hundred eight thousand, three hundred twenty-one".

Divisors: 1 11 19 209 97169 1068859 1846211 20308321