20189963 has 4 divisors (see below), whose sum is σ = 20521008. Its totient is φ = 19858920.

The previous prime is 20189941. The next prime is 20189969. The reversal of 20189963 is 36998102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36998102 = 2 ⋅18499051.

It is a cyclic number.

It is not a de Polignac number, because 20189963 - 2⁶ = 20189899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20189969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165431 + ... + 165552.

It is an arithmetic number, because the mean of its divisors is an integer number (5130252).

Almost surely, 2^20189963 is an apocalyptic number.

20189963 is a deficient number, since it is larger than the sum of its proper divisors (331045).

20189963 is an equidigital number, since it uses as much as digits as its factorization.

20189963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331044.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 20189963 is about 4493.3242705151. The cubic root of 20189963 is about 272.2984532186.

The spelling of 20189963 in words is "twenty million, one hundred eighty-nine thousand, nine hundred sixty-three".