20103564 has 72 divisors (see below), whose sum is σ = 53125632. Its totient is φ = 5903040.

The previous prime is 20103553. The next prime is 20103599. The reversal of 20103564 is 46530102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20103564.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46429 + ... + 46859.

It is an arithmetic number, because the mean of its divisors is an integer number (737856).

Almost surely, 2^20103564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20103564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26562816).

20103564 is an abundant number, since it is smaller than the sum of its proper divisors (33022068).

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

20103564 is a wasteful number, since it uses less digits than its factorization.

20103564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20103564 is about 4483.6998115396. The cubic root of 20103564 is about 271.9094818466.

Adding to 20103564 its reverse (46530102), we get a palindrome (66633666).

The spelling of 20103564 in words is "twenty million, one hundred three thousand, five hundred sixty-four".