20561324 has 24 divisors (see below), whose sum is σ = 41506080. Its totient is φ = 8729856.

The previous prime is 20561311. The next prime is 20561327. The reversal of 20561324 is 42316502.

It is a self number, because there is not a number n which added to its sum of digits gives 20561324.

It is not an unprimeable number, because it can be changed into a prime (20561327) 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, 317 + ... + 6420.

It is an arithmetic number, because the mean of its divisors is an integer number (1729420).

Almost surely, 2^20561324 is an apocalyptic number.

It is an amenable number.

20561324 is an abundant number, since it is smaller than the sum of its proper divisors (20944756).

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

20561324 is a wasteful number, since it uses less digits than its factorization.

20561324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857 (or 6855 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20561324 is about 4534.4596149927. The cubic root of 20561324 is about 273.9578140249.

Adding to 20561324 its reverse (42316502), we get a palindrome (62877826).

The spelling of 20561324 in words is "twenty million, five hundred sixty-one thousand, three hundred twenty-four".