20221097 has 4 divisors (see below), whose sum is σ = 21776580. Its totient is φ = 18665616.

The previous prime is 20221087. The next prime is 20221099. The reversal of 20221097 is 79012202.

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 9357481 + 10863616 = 3059^2 + 3296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221097 - 2¹⁰ = 20220073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20221099) 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, 777722 + ... + 777747.

It is an arithmetic number, because the mean of its divisors is an integer number (5444145).

Almost surely, 2^20221097 is an apocalyptic number.

It is an amenable number.

20221097 is a deficient number, since it is larger than the sum of its proper divisors (1555483).

20221097 is a wasteful number, since it uses less digits than its factorization.

20221097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555482.

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

The square root of 20221097 is about 4496.7874088064. The cubic root of 20221097 is about 272.4383475820.

Adding to 20221097 its reverse (79012202), we get a palindrome (99233299).

The spelling of 20221097 in words is "twenty million, two hundred twenty-one thousand, ninety-seven".