20226397 has 2 divisors, whose sum is σ = 20226398. Its totient is φ = 20226396.

The previous prime is 20226391. The next prime is 20226421. The reversal of 20226397 is 79362202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 3136441 = 4134^2 + 1771^2 .

It is a cyclic number.

It is not a de Polignac number, because 20226397 - 2³ = 20226389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20226391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10113198 + 10113199.

It is an arithmetic number, because the mean of its divisors is an integer number (10113199).

Almost surely, 2^20226397 is an apocalyptic number.

It is an amenable number.

20226397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20226397 is an equidigital number, since it uses as much as digits as its factorization.

20226397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20226397 is about 4497.3766797990. The cubic root of 20226397 is about 272.4621477597.

Adding to 20226397 its reverse (79362202), we get a palindrome (99588599).

The spelling of 20226397 in words is "twenty million, two hundred twenty-six thousand, three hundred ninety-seven".