16220617 has 12 divisors (see below), whose sum is σ = 19048260. Its totient is φ = 13771296.

The previous prime is 16220609. The next prime is 16220621. The reversal of 16220617 is 71602261.

It can be written as a sum of positive squares in 2 ways, for example, as 12595401 + 3625216 = 3549^2 + 1904^2 .

It is not a de Polignac number, because 16220617 - 2³ = 16220609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16220591 and 16220600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16220917) 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 11 ways as a sum of consecutive naturals, for example, 3823 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1587355).

Almost surely, 2^16220617 is an apocalyptic number.

It is an amenable number.

16220617 is a deficient number, since it is larger than the sum of its proper divisors (2827643).

16220617 is a wasteful number, since it uses less digits than its factorization.

16220617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160 (or 3153 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 16220617 is about 4027.4827125638. The cubic root of 16220617 is about 253.1370939098.

Adding to 16220617 its reverse (71602261), we get a palindrome (87822878).

The spelling of 16220617 in words is "sixteen million, two hundred twenty thousand, six hundred seventeen".