20766479 has 2 divisors, whose sum is σ = 20766480. Its totient is φ = 20766478.

The previous prime is 20766467. The next prime is 20766521. The reversal of 20766479 is 97466702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20766479 - 2²⁰ = 19717903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20766419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383239 + 10383240.

It is an arithmetic number, because the mean of its divisors is an integer number (10383240).

Almost surely, 2^20766479 is an apocalyptic number.

20766479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766479 is an equidigital number, since it uses as much as digits as its factorization.

20766479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 20766479 is about 4557.0252358309. The cubic root of 20766479 is about 274.8659578154.

The spelling of 20766479 in words is "twenty million, seven hundred sixty-six thousand, four hundred seventy-nine".