20244397 has 2 divisors, whose sum is σ = 20244398. Its totient is φ = 20244396.

The previous prime is 20244391. The next prime is 20244409. The reversal of 20244397 is 79344202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19766916 + 477481 = 4446^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 20244397 - 2⁷ = 20244269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20244391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122198 + 10122199.

It is an arithmetic number, because the mean of its divisors is an integer number (10122199).

Almost surely, 2^20244397 is an apocalyptic number.

It is an amenable number.

20244397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244397 is an equidigital number, since it uses as much as digits as its factorization.

20244397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20244397 is about 4499.3774013746. The cubic root of 20244397 is about 272.5429475276.

Adding to 20244397 its reverse (79344202), we get a palindrome (99588599).

The spelling of 20244397 in words is "twenty million, two hundred forty-four thousand, three hundred ninety-seven".