20623659 has 12 divisors (see below), whose sum is σ = 31987944. Its totient is φ = 11784864.

The previous prime is 20623643. The next prime is 20623693. The reversal of 20623659 is 95632602.

It is not a de Polignac number, because 20623659 - 2⁴ = 20623643 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20623609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70002 + ... + 70295.

It is an arithmetic number, because the mean of its divisors is an integer number (2665662).

Almost surely, 2^20623659 is an apocalyptic number.

20623659 is a deficient number, since it is larger than the sum of its proper divisors (11364285).

20623659 is a wasteful number, since it uses less digits than its factorization.

20623659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140314 (or 140307 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 20623659 is about 4541.3278895054. The cubic root of 20623659 is about 274.2343839570.

The spelling of 20623659 in words is "twenty million, six hundred twenty-three thousand, six hundred fifty-nine".