20389963 has 8 divisors (see below), whose sum is σ = 22717440. Its totient is φ = 18141480.

The previous prime is 20389951. The next prime is 20389991. The reversal of 20389963 is 36998302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20389963 - 2²¹ = 18292811 is a prime.

It is a super-2 number, since 2×20389963² = 831501182282738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20389903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19203 + ... + 20236.

It is an arithmetic number, because the mean of its divisors is an integer number (2839680).

Almost surely, 2^20389963 is an apocalyptic number.

20389963 is a deficient number, since it is larger than the sum of its proper divisors (2327477).

20389963 is a wasteful number, since it uses less digits than its factorization.

20389963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39497.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20389963 is about 4515.5246649753. The cubic root of 20389963 is about 273.1946220967.

It can be divided in two parts, 20 and 389963, that added together give a palindrome (389983).

The spelling of 20389963 in words is "twenty million, three hundred eighty-nine thousand, nine hundred sixty-three".