20104320 has 128 divisors (see below), whose sum is σ = 66047040. Its totient is φ = 5197824.

The previous prime is 20104313. The next prime is 20104333. The reversal of 20104320 is 2340102.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20104296 and 20104305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70899 + ... + 71181.

Almost surely, 2^20104320 is an apocalyptic number.

20104320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20104320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33023520).

20104320 is an abundant number, since it is smaller than the sum of its proper divisors (45942720).

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

20104320 is a wasteful number, since it uses less digits than its factorization.

20104320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20104320 is about 4483.7841161233. The cubic root of 20104320 is about 271.9128902139.

Adding to 20104320 its reverse (2340102), we get a palindrome (22444422).

The spelling of 20104320 in words is "twenty million, one hundred four thousand, three hundred twenty".