20004401997 has 12 divisors (see below), whose sum is σ = 30416050080. Its totient is φ = 12634359048.

The previous prime is 20004401987. The next prime is 20004402017. The reversal of 20004401997 is 79910440002.

20004401997 is a `hidden beast` number, since 20 + 0 + 0 + 440 + 199 + 7 = 666.

It is not a de Polignac number, because 20004401997 - 2⁸ = 20004401741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004401957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58492233 + ... + 58492574.

It is an arithmetic number, because the mean of its divisors is an integer number (2534670840).

Almost surely, 2^20004401997 is an apocalyptic number.

It is an amenable number.

20004401997 is a deficient number, since it is larger than the sum of its proper divisors (10411648083).

20004401997 is a wasteful number, since it uses less digits than its factorization.

20004401997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116984832 (or 116984829 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

Adding to 20004401997 its reverse (79910440002), we get a palindrome (99914841999).

The spelling of 20004401997 in words is "twenty billion, four million, four hundred one thousand, nine hundred ninety-seven".