20865127 has 2 divisors, whose sum is σ = 20865128. Its totient is φ = 20865126.

The previous prime is 20865113. The next prime is 20865149. The reversal of 20865127 is 72156802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20865127 - 2⁷ = 20864999 is a prime.

It is a super-2 number, since 2×20865127² = 870707049452258, which contains 22 as substring.

It is equal to p_1321969 and since 20865127 and 1321969 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20865167) 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 as a sum of consecutive naturals, namely, 10432563 + 10432564.

It is an arithmetic number, because the mean of its divisors is an integer number (10432564).

Almost surely, 2^20865127 is an apocalyptic number.

20865127 is a deficient number, since it is larger than the sum of its proper divisors (1).

20865127 is an equidigital number, since it uses as much as digits as its factorization.

20865127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 20865127 is about 4567.8361397931. The cubic root of 20865127 is about 275.3005067628.

The spelling of 20865127 in words is "twenty million, eight hundred sixty-five thousand, one hundred twenty-seven".