19900663 has 2 divisors, whose sum is σ = 19900664. Its totient is φ = 19900662.

The previous prime is 19900651. The next prime is 19900679. The reversal of 19900663 is 36600991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19900663 - 2⁵ = 19900631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19900633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950331 + 9950332.

It is an arithmetic number, because the mean of its divisors is an integer number (9950332).

Almost surely, 2^19900663 is an apocalyptic number.

19900663 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900663 is an equidigital number, since it uses as much as digits as its factorization.

19900663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 19900663 is about 4461.0159156856. The cubic root of 19900663 is about 270.9916120550.

The spelling of 19900663 in words is "nineteen million, nine hundred thousand, six hundred sixty-three".