20123659 has 2 divisors, whose sum is σ = 20123660. Its totient is φ = 20123658.

The previous prime is 20123633. The next prime is 20123683. The reversal of 20123659 is 95632102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123659 - 2⁵ = 20123627 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061829 + 10061830.

It is an arithmetic number, because the mean of its divisors is an integer number (10061830).

Almost surely, 2^20123659 is an apocalyptic number.

20123659 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123659 is an equidigital number, since it uses as much as digits as its factorization.

20123659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20123659 is about 4485.9401467251. The cubic root of 20123659 is about 272.0000495603. Note that the first 4 decimals are identical.

It can be divided in two parts, 201236 and 59, that added together give a triangular number (201295 = T₆₃₄).

The spelling of 20123659 in words is "twenty million, one hundred twenty-three thousand, six hundred fifty-nine".