20259197 has 24 divisors (see below), whose sum is σ = 24931800. Its totient is φ = 16388736.

The previous prime is 20259193. The next prime is 20259199. The reversal of 20259197 is 79195202.

It can be written as a sum of positive squares in 4 ways, for example, as 1301881 + 18957316 = 1141^2 + 4354^2 .

It is not a de Polignac number, because 20259197 - 2² = 20259193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75179 + ... + 75447.

It is an arithmetic number, because the mean of its divisors is an integer number (1038825).

Almost surely, 2^20259197 is an apocalyptic number.

It is an amenable number.

20259197 is a deficient number, since it is larger than the sum of its proper divisors (4672603).

20259197 is a wasteful number, since it uses less digits than its factorization.

20259197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 20259197 is about 4501.0217728867. The cubic root of 20259197 is about 272.6093470203.

The spelling of 20259197 in words is "twenty million, two hundred fifty-nine thousand, one hundred ninety-seven".