20022197 has 4 divisors (see below), whose sum is σ = 21562380. Its totient is φ = 18482016.

The previous prime is 20022193. The next prime is 20022199. The reversal of 20022197 is 79122002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12327121 + 7695076 = 3511^2 + 2774^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022197 - 2² = 20022193 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 (20022193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770072 + ... + 770097.

It is an arithmetic number, because the mean of its divisors is an integer number (5390595).

Almost surely, 2^20022197 is an apocalyptic number.

It is an amenable number.

20022197 is a deficient number, since it is larger than the sum of its proper divisors (1540183).

20022197 is a wasteful number, since it uses less digits than its factorization.

20022197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540182.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20022197 is about 4474.6169668476. The cubic root of 20022197 is about 271.5421444118.

Adding to 20022197 its reverse (79122002), we get a palindrome (99144199).

The spelling of 20022197 in words is "twenty million, twenty-two thousand, one hundred ninety-seven".