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20451317 is a prime number
BaseRepresentation
bin100111000000…
…0111111110101
31102111000221012
41032000333311
520213420232
62010202005
7335555555
oct116007765
942430835
1020451317
11105a9417
126a23305
134310993
142a05165
151bde9b2
hex1380ff5

20451317 has 2 divisors, whose sum is σ = 20451318. Its totient is φ = 20451316.

The previous prime is 20451311. The next prime is 20451329. The reversal of 20451317 is 71315402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19439281 + 1012036 = 4409^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451317 - 26 = 20451253 is a prime.

It is a Chen prime.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 20451292 and 20451301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225658 + 10225659.

It is an arithmetic number, because the mean of its divisors is an integer number (10225659).

Almost surely, 220451317 is an apocalyptic number.

It is an amenable number.

20451317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451317 is an equidigital number, since it uses as much as digits as its factorization.

20451317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20451317 is about 4522.3132355024. The cubic root of 20451317 is about 273.4683646052.

Adding to 20451317 its reverse (71315402), we get a palindrome (91766719).

The spelling of 20451317 in words is "twenty million, four hundred fifty-one thousand, three hundred seventeen".