20779427 has 2 divisors, whose sum is σ = 20779428. Its totient is φ = 20779426.

The previous prime is 20779411. The next prime is 20779441. The reversal of 20779427 is 72497702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20779427 - 2⁴ = 20779411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20779477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389713 + 10389714.

It is an arithmetic number, because the mean of its divisors is an integer number (10389714).

Almost surely, 2^20779427 is an apocalyptic number.

20779427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779427 is an equidigital number, since it uses as much as digits as its factorization.

20779427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 20779427 is about 4558.4456780793. The cubic root of 20779427 is about 274.9230726976.

The spelling of 20779427 in words is "twenty million, seven hundred seventy-nine thousand, four hundred twenty-seven".