20696279 has 2 divisors, whose sum is σ = 20696280. Its totient is φ = 20696278.

The previous prime is 20696257. The next prime is 20696281. The reversal of 20696279 is 97269602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20696279 is a prime.

Together with 20696281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20696219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10348139 + 10348140.

It is an arithmetic number, because the mean of its divisors is an integer number (10348140).

Almost surely, 2^20696279 is an apocalyptic number.

20696279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20696279 is an equidigital number, since it uses as much as digits as its factorization.

20696279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20696279 is about 4549.3163222621. The cubic root of 20696279 is about 274.5558848088. Note that the first 3 decimals are identical.

The spelling of 20696279 in words is "twenty million, six hundred ninety-six thousand, two hundred seventy-nine".