20851273 has 2 divisors, whose sum is σ = 20851274. Its totient is φ = 20851272.

The previous prime is 20851267. The next prime is 20851277. The reversal of 20851273 is 37215802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15976009 + 4875264 = 3997^2 + 2208^2 .

It is a cyclic number.

It is not a de Polignac number, because 20851273 - 2⁹ = 20850761 is a prime.

It is not a weakly prime, because it can be changed into another prime (20851277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10425636 + 10425637.

It is an arithmetic number, because the mean of its divisors is an integer number (10425637).

Almost surely, 2^20851273 is an apocalyptic number.

It is an amenable number.

20851273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20851273 is an equidigital number, since it uses as much as digits as its factorization.

20851273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20851273 is about 4566.3194150212. The cubic root of 20851273 is about 275.2395620475.

The spelling of 20851273 in words is "twenty million, eight hundred fifty-one thousand, two hundred seventy-three".