20104728 has 32 divisors (see below), whose sum is σ = 57442560. Its totient is φ = 5744160.

The previous prime is 20104703. The next prime is 20104729. The reversal of 20104728 is 82740102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20104698 and 20104707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104729) 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, 59668 + ... + 60003.

It is an arithmetic number, because the mean of its divisors is an integer number (1795080).

Almost surely, 2^20104728 is an apocalyptic number.

20104728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20104728 is an abundant number, since it is smaller than the sum of its proper divisors (37337832).

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

20104728 is a wasteful number, since it uses less digits than its factorization.

20104728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119687 (or 119683 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20104728 is about 4483.8296131767. The cubic root of 20104728 is about 271.9147296147.

The spelling of 20104728 in words is "twenty million, one hundred four thousand, seven hundred twenty-eight".