20823305 has 8 divisors (see below), whose sum is σ = 25849800. Its totient is φ = 16084096.

The previous prime is 20823287. The next prime is 20823307. The reversal of 20823305 is 50332802.

It can be written as a sum of positive squares in 4 ways, for example, as 537289 + 20286016 = 733^2 + 4504^2 .

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

It is not a de Polignac number, because 20823305 - 2¹⁰ = 20822281 is a prime.

It is a super-2 number, since 2×20823305² = 867220062246050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20823307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71660 + ... + 71949.

It is an arithmetic number, because the mean of its divisors is an integer number (3231225).

Almost surely, 2^20823305 is an apocalyptic number.

It is an amenable number.

20823305 is a deficient number, since it is larger than the sum of its proper divisors (5026495).

20823305 is a wasteful number, since it uses less digits than its factorization.

20823305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143643.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20823305 is about 4563.2559647690. The cubic root of 20823305 is about 275.1164465524.

The spelling of 20823305 in words is "twenty million, eight hundred twenty-three thousand, three hundred five".