20005963 has 4 divisors (see below), whose sum is σ = 20383488. Its totient is φ = 19628440.

The previous prime is 20005949. The next prime is 20005981. The reversal of 20005963 is 36950002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20005963 - 2⁹ = 20005451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005903) 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, 188683 + ... + 188788.

It is an arithmetic number, because the mean of its divisors is an integer number (5095872).

Almost surely, 2^20005963 is an apocalyptic number.

20005963 is a deficient number, since it is larger than the sum of its proper divisors (377525).

20005963 is an equidigital number, since it uses as much as digits as its factorization.

20005963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377524.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20005963 is about 4472.8025889815. The cubic root of 20005963 is about 271.4687357660.

Adding to 20005963 its reverse (36950002), we get a palindrome (56955965).

The spelling of 20005963 in words is "twenty million, five thousand, nine hundred sixty-three".