20450197 has 4 divisors (see below), whose sum is σ = 21339360. Its totient is φ = 19561036.

The previous prime is 20450149. The next prime is 20450207. The reversal of 20450197 is 79105402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20450197 - 2¹⁵ = 20417429 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 (20450107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444547 + ... + 444592.

It is an arithmetic number, because the mean of its divisors is an integer number (5334840).

Almost surely, 2^20450197 is an apocalyptic number.

It is an amenable number.

20450197 is a deficient number, since it is larger than the sum of its proper divisors (889163).

20450197 is an equidigital number, since it uses as much as digits as its factorization.

20450197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889162.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20450197 is about 4522.1894033753. The cubic root of 20450197 is about 273.4633724221.

Adding to 20450197 its reverse (79105402), we get a palindrome (99555599).

The spelling of 20450197 in words is "twenty million, four hundred fifty thousand, one hundred ninety-seven".