20420759 has 2 divisors, whose sum is σ = 20420760. Its totient is φ = 20420758.

The previous prime is 20420681. The next prime is 20420761. The reversal of 20420759 is 95702402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20420759 - 2⁸ = 20420503 is a prime.

It is a Sophie Germain prime.

Together with 20420761, 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 (20420359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210379 + 10210380.

It is an arithmetic number, because the mean of its divisors is an integer number (10210380).

Almost surely, 2^20420759 is an apocalyptic number.

20420759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420759 is an equidigital number, since it uses as much as digits as its factorization.

20420759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20420759 is about 4518.9333918526. The cubic root of 20420759 is about 273.3320928293.

The spelling of 20420759 in words is "twenty million, four hundred twenty thousand, seven hundred fifty-nine".