20318651 has 2 divisors, whose sum is σ = 20318652. Its totient is φ = 20318650.

The previous prime is 20318593. The next prime is 20318659. The reversal of 20318651 is 15681302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20318651 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20318651.

It is not a weakly prime, because it can be changed into another prime (20318659) 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 as a sum of consecutive naturals, namely, 10159325 + 10159326.

It is an arithmetic number, because the mean of its divisors is an integer number (10159326).

Almost surely, 2^20318651 is an apocalyptic number.

20318651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20318651 is an equidigital number, since it uses as much as digits as its factorization.

20318651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20318651 is about 4507.6214348590. The cubic root of 20318651 is about 272.8757591452.

Adding to 20318651 its reverse (15681302), we get a palindrome (35999953).

The spelling of 20318651 in words is "twenty million, three hundred eighteen thousand, six hundred fifty-one".