20400323 has 8 divisors (see below), whose sum is σ = 21695040. Its totient is φ = 19116160.

The previous prime is 20400307. The next prime is 20400337. The reversal of 20400323 is 32300402.

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

It is not a de Polignac number, because 20400323 - 2⁴ = 20400307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400298 and 20400307.

It is not an unprimeable number, because it can be changed into a prime (20400353) 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, 1553 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (2711880).

Almost surely, 2^20400323 is an apocalyptic number.

20400323 is a deficient number, since it is larger than the sum of its proper divisors (1294717).

20400323 is a wasteful number, since it uses less digits than its factorization.

20400323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277.

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20400323 is about 4516.6716728140. The cubic root of 20400323 is about 273.2408836989.

Adding to 20400323 its reverse (32300402), we get a palindrome (52700725).

The spelling of 20400323 in words is "twenty million, four hundred thousand, three hundred twenty-three".