20345659 has 2 divisors, whose sum is σ = 20345660. Its totient is φ = 20345658.

The previous prime is 20345629. The next prime is 20345669. The reversal of 20345659 is 95654302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20345659 - 2⁷ = 20345531 is a prime.

It is not a weakly prime, because it can be changed into another prime (20345629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172829 + 10172830.

It is an arithmetic number, because the mean of its divisors is an integer number (10172830).

Almost surely, 2^20345659 is an apocalyptic number.

20345659 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345659 is an equidigital number, since it uses as much as digits as its factorization.

20345659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 20345659 is about 4510.6162550144. The cubic root of 20345659 is about 272.9966097787.

The spelling of 20345659 in words is "twenty million, three hundred forty-five thousand, six hundred fifty-nine".