20063971 has 4 divisors (see below), whose sum is σ = 20490912. Its totient is φ = 19637032.

The previous prime is 20063951. The next prime is 20063987. The reversal of 20063971 is 17936002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20063971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20063951) 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, 213400 + ... + 213493.

It is an arithmetic number, because the mean of its divisors is an integer number (5122728).

Almost surely, 2^20063971 is an apocalyptic number.

20063971 is a deficient number, since it is larger than the sum of its proper divisors (426941).

20063971 is an equidigital number, since it uses as much as digits as its factorization.

20063971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426940.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20063971 is about 4479.2824202097. The cubic root of 20063971 is about 271.7308603283.

Adding to 20063971 its reverse (17936002), we get a palindrome (37999973).

The spelling of 20063971 in words is "twenty million, sixty-three thousand, nine hundred seventy-one".