20104578 has 48 divisors (see below), whose sum is σ = 48399840. Its totient is φ = 6183216.

The previous prime is 20104577. The next prime is 20104589. The reversal of 20104578 is 87540102.

20104578 is a `hidden beast` number, since 201 + 0 + 457 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20104571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8025 + ... + 10227.

It is an arithmetic number, because the mean of its divisors is an integer number (1008330).

Almost surely, 2^20104578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20104578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24199920).

20104578 is an abundant number, since it is smaller than the sum of its proper divisors (28295262).

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

20104578 is a wasteful number, since it uses less digits than its factorization.

20104578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2221 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20104578 is about 4483.8128863725. The cubic root of 20104578 is about 271.9140533673.

The spelling of 20104578 in words is "twenty million, one hundred four thousand, five hundred seventy-eight".