20622121 has 8 divisors (see below), whose sum is σ = 22264200. Its totient is φ = 18988032.

The previous prime is 20622109. The next prime is 20622149. The reversal of 20622121 is 12122602.

It can be written as a sum of positive squares in 4 ways, for example, as 3515625 + 17106496 = 1875^2 + 4136^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20622121 - 2⁹ = 20621609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20622095 and 20622104.

It is not an unprimeable number, because it can be changed into a prime (20622181) 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 7 ways as a sum of consecutive naturals, for example, 4071 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (2783025).

Almost surely, 2^20622121 is an apocalyptic number.

It is an amenable number.

20622121 is a deficient number, since it is larger than the sum of its proper divisors (1642079).

20622121 is a wasteful number, since it uses less digits than its factorization.

20622121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3995.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20622121 is about 4541.1585526163. The cubic root of 20622121 is about 274.2275668193.

Adding to 20622121 its reverse (12122602), we get a palindrome (32744723).

The spelling of 20622121 in words is "twenty million, six hundred twenty-two thousand, one hundred twenty-one".