20403320 has 32 divisors (see below), whose sum is σ = 52466400. Its totient is φ = 6995328.

The previous prime is 20403307. The next prime is 20403329. The reversal of 20403320 is 2330402.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20403295 and 20403304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403329) 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 7 ways as a sum of consecutive naturals, for example, 36155 + ... + 36714.

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

Almost surely, 2^20403320 is an apocalyptic number.

20403320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20403320 is an abundant number, since it is smaller than the sum of its proper divisors (32063080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20403320 is a wasteful number, since it uses less digits than its factorization.

20403320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72887 (or 72883 counting only the distinct ones).

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

The square root of 20403320 is about 4517.0034314798. The cubic root of 20403320 is about 273.2542635986.

Adding to 20403320 its reverse (2330402), we get a palindrome (22733722).

The spelling of 20403320 in words is "twenty million, four hundred three thousand, three hundred twenty".