20004997 has 2 divisors, whose sum is σ = 20004998. Its totient is φ = 20004996.

The previous prime is 20004979. The next prime is 20005003. The reversal of 20004997 is 79940002.

Together with previous prime (20004979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11249316 + 8755681 = 3354^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004997 - 2¹⁹ = 19480709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002498 + 10002499.

It is an arithmetic number, because the mean of its divisors is an integer number (10002499).

Almost surely, 2^20004997 is an apocalyptic number.

It is an amenable number.

20004997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004997 is an equidigital number, since it uses as much as digits as its factorization.

20004997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20004997 is about 4472.6946016915. The cubic root of 20004997 is about 271.4643663517.

Adding to 20004997 its reverse (79940002), we get a palindrome (99944999).

The spelling of 20004997 in words is "twenty million, four thousand, nine hundred ninety-seven".