20671279 has 2 divisors, whose sum is σ = 20671280. Its totient is φ = 20671278.

The previous prime is 20671267. The next prime is 20671289. The reversal of 20671279 is 97217602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20671279 - 2⁵ = 20671247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20671249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335639 + 10335640.

It is an arithmetic number, because the mean of its divisors is an integer number (10335640).

Almost surely, 2^20671279 is an apocalyptic number.

20671279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20671279 is an equidigital number, since it uses as much as digits as its factorization.

20671279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 20671279 is about 4546.5678263939. The cubic root of 20671279 is about 274.4452906497.

The spelling of 20671279 in words is "twenty million, six hundred seventy-one thousand, two hundred seventy-nine".