20231279 has 2 divisors, whose sum is σ = 20231280. Its totient is φ = 20231278.

The previous prime is 20231273. The next prime is 20231287. The reversal of 20231279 is 97213202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20231279 - 2⁸ = 20231023 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_1284326 and since 20231279 and 1284326 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 (20231273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115639 + 10115640.

It is an arithmetic number, because the mean of its divisors is an integer number (10115640).

Almost surely, 2^20231279 is an apocalyptic number.

20231279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20231279 is an equidigital number, since it uses as much as digits as its factorization.

20231279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20231279 is about 4497.9194079041. The cubic root of 20231279 is about 272.4840671884.

The spelling of 20231279 in words is "twenty million, two hundred thirty-one thousand, two hundred seventy-nine".