20407859 has 2 divisors, whose sum is σ = 20407860. Its totient is φ = 20407858.

The previous prime is 20407853. The next prime is 20407861. The reversal of 20407859 is 95870402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20407859 - 2¹² = 20403763 is a prime.

Together with 20407861, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20407853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203929 + 10203930.

It is an arithmetic number, because the mean of its divisors is an integer number (10203930).

Almost surely, 2^20407859 is an apocalyptic number.

20407859 is a deficient number, since it is larger than the sum of its proper divisors (1).

20407859 is an equidigital number, since it uses as much as digits as its factorization.

20407859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20407859 is about 4517.5058384024. The cubic root of 20407859 is about 273.2745251564.

The spelling of 20407859 in words is "twenty million, four hundred seven thousand, eight hundred fifty-nine".