20350397 has 2 divisors, whose sum is σ = 20350398. Its totient is φ = 20350396.

The previous prime is 20350367. The next prime is 20350399. The reversal of 20350397 is 79305302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17480761 + 2869636 = 4181^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350397 - 2¹² = 20346301 is a prime.

Together with 20350399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20350399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175198 + 10175199.

It is an arithmetic number, because the mean of its divisors is an integer number (10175199).

Almost surely, 2^20350397 is an apocalyptic number.

It is an amenable number.

20350397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350397 is an equidigital number, since it uses as much as digits as its factorization.

20350397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 29.

The square root of 20350397 is about 4511.1414298379. The cubic root of 20350397 is about 273.0177995166.

Adding to 20350397 its reverse (79305302), we get a palindrome (99655699).

The spelling of 20350397 in words is "twenty million, three hundred fifty thousand, three hundred ninety-seven".