20818323 has 8 divisors (see below), whose sum is σ = 30842000. Its totient is φ = 13878864.

The previous prime is 20818313. The next prime is 20818333. The reversal of 20818323 is 32381802.

It is an interprime number because it is at equal distance from previous prime (20818313) and next prime (20818333).

It is not a de Polignac number, because 20818323 - 2¹⁴ = 20801939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 771049 = 20818323 / (2 + 0 + 8 + 1 + 8 + 3 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818313) 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, 385498 + ... + 385551.

It is an arithmetic number, because the mean of its divisors is an integer number (3855250).

Almost surely, 2^20818323 is an apocalyptic number.

20818323 is a deficient number, since it is larger than the sum of its proper divisors (10023677).

20818323 is an equidigital number, since it uses as much as digits as its factorization.

20818323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771058 (or 771052 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20818323 is about 4562.7100499593. The cubic root of 20818323 is about 275.0945041589.

It can be divided in two parts, 2081 and 8323, that added together give a square (10404 = 102²).

The spelling of 20818323 in words is "twenty million, eight hundred eighteen thousand, three hundred twenty-three".