20357663 has 2 divisors, whose sum is σ = 20357664. Its totient is φ = 20357662.

The previous prime is 20357657. The next prime is 20357677. The reversal of 20357663 is 36675302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20357663 - 2¹⁰ = 20356639 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20357633) 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, 10178831 + 10178832.

It is an arithmetic number, because the mean of its divisors is an integer number (10178832).

Almost surely, 2^20357663 is an apocalyptic number.

20357663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20357663 is an equidigital number, since it uses as much as digits as its factorization.

20357663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20357663 is about 4511.9466973802. The cubic root of 20357663 is about 273.0502888301.

The spelling of 20357663 in words is "twenty million, three hundred fifty-seven thousand, six hundred sixty-three".