20892217 has 2 divisors, whose sum is σ = 20892218. Its totient is φ = 20892216.

The previous prime is 20892197. The next prime is 20892241. The reversal of 20892217 is 71229802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17007376 + 3884841 = 4124^2 + 1971^2 .

It is a cyclic number.

It is not a de Polignac number, because 20892217 - 2²³ = 12503609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20892617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446108 + 10446109.

It is an arithmetic number, because the mean of its divisors is an integer number (10446109).

Almost surely, 2^20892217 is an apocalyptic number.

It is an amenable number.

20892217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20892217 is an equidigital number, since it uses as much as digits as its factorization.

20892217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20892217 is about 4570.8004769406. The cubic root of 20892217 is about 275.4195996625.

The spelling of 20892217 in words is "twenty million, eight hundred ninety-two thousand, two hundred seventeen".