20827517 has 2 divisors, whose sum is σ = 20827518. Its totient is φ = 20827516.

The previous prime is 20827511. The next prime is 20827571. The reversal of 20827517 is 71572802.

Together with next prime (20827571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 568516 = 4501^2 + 754^2 .

It is a cyclic number.

It is not a de Polignac number, because 20827517 - 2⁴ = 20827501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20827511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413758 + 10413759.

It is an arithmetic number, because the mean of its divisors is an integer number (10413759).

Almost surely, 2^20827517 is an apocalyptic number.

It is an amenable number.

20827517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20827517 is an equidigital number, since it uses as much as digits as its factorization.

20827517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 20827517 is about 4563.7174540061. The cubic root of 20827517 is about 275.1349948785.

The spelling of 20827517 in words is "twenty million, eight hundred twenty-seven thousand, five hundred seventeen".