20412397 has 2 divisors, whose sum is σ = 20412398. Its totient is φ = 20412396.

The previous prime is 20412377. The next prime is 20412409. The reversal of 20412397 is 79321402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20241001 + 171396 = 4499^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412397 - 2⁷ = 20412269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20412377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206198 + 10206199.

It is an arithmetic number, because the mean of its divisors is an integer number (10206199).

Almost surely, 2^20412397 is an apocalyptic number.

It is an amenable number.

20412397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412397 is an equidigital number, since it uses as much as digits as its factorization.

20412397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20412397 is about 4518.0080787887. The cubic root of 20412397 is about 273.2947792472.

Adding to 20412397 its reverse (79321402), we get a palindrome (99733799).

The spelling of 20412397 in words is "twenty million, four hundred twelve thousand, three hundred ninety-seven".