20622217 has 16 divisors (see below), whose sum is σ = 25961472. Its totient is φ = 15912720.

The previous prime is 20622197. The next prime is 20622229. The reversal of 20622217 is 71222602.

20622217 is nontrivially palindromic in base 8.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20622217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20622257) 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 15 ways as a sum of consecutive naturals, for example, 6988 + ... + 9490.

It is an arithmetic number, because the mean of its divisors is an integer number (1622592).

Almost surely, 2^20622217 is an apocalyptic number.

It is an amenable number.

20622217 is a deficient number, since it is larger than the sum of its proper divisors (5339255).

20622217 is a wasteful number, since it uses less digits than its factorization.

20622217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20622217 is about 4541.1691225939. The cubic root of 20622217 is about 274.2279923463.

Adding to 20622217 its reverse (71222602), we get a palindrome (91844819).

The spelling of 20622217 in words is "twenty million, six hundred twenty-two thousand, two hundred seventeen".