20623205 has 16 divisors (see below), whose sum is σ = 26233200. Its totient is φ = 15536640.

The previous prime is 20623181. The next prime is 20623217. The reversal of 20623205 is 50232602.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7540516 + 13082689 = 2746^2 + 3617^2 .

It is not a de Polignac number, because 20623205 - 2¹⁰ = 20622181 is a prime.

It is a super-3 number, since 3×20623205³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4211 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (1639575).

Almost surely, 2^20623205 is an apocalyptic number.

It is an amenable number.

20623205 is a deficient number, since it is larger than the sum of its proper divisors (5609995).

20623205 is a wasteful number, since it uses less digits than its factorization.

20623205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20623205 is about 4541.2779038504. The cubic root of 20623205 is about 274.2323716512.

Adding to 20623205 its reverse (50232602), we get a palindrome (70855807).

The spelling of 20623205 in words is "twenty million, six hundred twenty-three thousand, two hundred five".