20430320 has 40 divisors (see below), whose sum is σ = 50004240. Its totient is φ = 7741440.

The previous prime is 20430307. The next prime is 20430323. The reversal of 20430320 is 2303402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 20430295 and 20430304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430323) 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, 5201 + ... + 8240.

It is an arithmetic number, because the mean of its divisors is an integer number (1250106).

Almost surely, 2^20430320 is an apocalyptic number.

20430320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430320 is an abundant number, since it is smaller than the sum of its proper divisors (29573920).

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

20430320 is a wasteful number, since it uses less digits than its factorization.

20430320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13473 (or 13467 counting only the distinct ones).

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

The square root of 20430320 is about 4519.9911504338. The cubic root of 20430320 is about 273.3747442050.

Adding to 20430320 its reverse (2303402), we get a palindrome (22733722).

The spelling of 20430320 in words is "twenty million, four hundred thirty thousand, three hundred twenty".