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20425169 is a prime number
BaseRepresentation
bin100110111101…
…0100111010001
31102102201001202
41031322213101
520212101134
62005440545
7335416412
oct115724721
942381052
1020425169
1110590806
126a10155
134301acb
1429d9809
151bd6d7e
hex137a9d1

20425169 has 2 divisors, whose sum is σ = 20425170. Its totient is φ = 20425168.

The previous prime is 20425159. The next prime is 20425189. The reversal of 20425169 is 96152402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14348944 + 6076225 = 3788^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425169 - 28 = 20424913 is a prime.

It is a super-3 number, since 3×204251693 (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20425159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212584 + 10212585.

It is an arithmetic number, because the mean of its divisors is an integer number (10212585).

Almost surely, 220425169 is an apocalyptic number.

It is an amenable number.

20425169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425169 is an equidigital number, since it uses as much as digits as its factorization.

20425169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20425169 is about 4519.4213125134. The cubic root of 20425169 is about 273.3517673799.

The spelling of 20425169 in words is "twenty million, four hundred twenty-five thousand, one hundred sixty-nine".