20851267 has 2 divisors, whose sum is σ = 20851268. Its totient is φ = 20851266.

The previous prime is 20851253. The next prime is 20851273. The reversal of 20851267 is 76215802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20851267 is a prime.

It is a Chen 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, 10425633 + 10425634.

It is an arithmetic number, because the mean of its divisors is an integer number (10425634).

Almost surely, 2^20851267 is an apocalyptic number.

20851267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20851267 is an equidigital number, since it uses as much as digits as its factorization.

20851267 is an evil number, because the sum of its binary digits is even.

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

The square root of 20851267 is about 4566.3187580369. The cubic root of 20851267 is about 275.2395356472.

The spelling of 20851267 in words is "twenty million, eight hundred fifty-one thousand, two hundred sixty-seven".