20222517 has 16 divisors (see below), whose sum is σ = 32437760. Its totient is φ = 10947312.

The previous prime is 20222473. The next prime is 20222557. The reversal of 20222517 is 71522202.

It is a happy number.

It is not a de Polignac number, because 20222517 - 2²⁴ = 3445301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20222493 and 20222502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222557) 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 15 ways as a sum of consecutive naturals, for example, 24943 + ... + 25740.

It is an arithmetic number, because the mean of its divisors is an integer number (2027360).

Almost surely, 2^20222517 is an apocalyptic number.

It is an amenable number.

20222517 is a deficient number, since it is larger than the sum of its proper divisors (12215243).

20222517 is a wasteful number, since it uses less digits than its factorization.

20222517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50712.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20222517 is about 4496.9452965319. The cubic root of 20222517 is about 272.4447246412. Note that the first 3 decimals are identical.

Adding to 20222517 its reverse (71522202), we get a palindrome (91744719).

The spelling of 20222517 in words is "twenty million, two hundred twenty-two thousand, five hundred seventeen".