20104724 has 12 divisors (see below), whose sum is σ = 35236404. Its totient is φ = 10037184.

The previous prime is 20104703. The next prime is 20104729. The reversal of 20104724 is 42740102.

It can be written as a sum of positive squares in 2 ways, for example, as 9424900 + 10679824 = 3070^2 + 3268^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20104696 and 20104705.

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 3 ways as a sum of consecutive naturals, for example, 497 + ... + 6360.

It is an arithmetic number, because the mean of its divisors is an integer number (2936367).

Almost surely, 2^20104724 is an apocalyptic number.

It is an amenable number.

20104724 is a deficient number, since it is larger than the sum of its proper divisors (15131680).

20104724 is a wasteful number, since it uses less digits than its factorization.

20104724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7594 (or 7592 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20104724 is about 4483.8291671294. The cubic root of 20104724 is about 271.9147115815.

Adding to 20104724 its reverse (42740102), we get a palindrome (62844826).

The spelling of 20104724 in words is "twenty million, one hundred four thousand, seven hundred twenty-four".