20104560 has 120 divisors (see below), whose sum is σ = 77182560. Its totient is φ = 4594176.

The previous prime is 20104559. The next prime is 20104571. The reversal of 20104560 is 6540102.

It is a happy number.

20104560 is a `hidden beast` number, since 2 + 0 + 104 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3046 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (643188).

Almost surely, 2^20104560 is an apocalyptic number.

20104560 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 20104560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38591280).

20104560 is an abundant number, since it is smaller than the sum of its proper divisors (57078000).

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

20104560 is a wasteful number, since it uses less digits than its factorization.

20104560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015 (or 4006 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20104560 is about 4483.8108791518. The cubic root of 20104560 is about 271.9139722174.

Adding to 20104560 its reverse (6540102), we get a palindrome (26644662).

The spelling of 20104560 in words is "twenty million, one hundred four thousand, five hundred sixty".