20216504 has 64 divisors (see below), whose sum is σ = 48591360. Its totient is φ = 7655040.

The previous prime is 20216501. The next prime is 20216507. The reversal of 20216504 is 40561202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20216501) and next prime (20216507).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22349 + ... + 23235.

It is an arithmetic number, because the mean of its divisors is an integer number (759240).

Almost surely, 2^20216504 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 20216504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24295680).

20216504 is an abundant number, since it is smaller than the sum of its proper divisors (28374856).

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

20216504 is a wasteful number, since it uses less digits than its factorization.

20216504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20216504 is about 4496.2766818780. The cubic root of 20216504 is about 272.4177188943.

Adding to 20216504 its reverse (40561202), we get a palindrome (60777706).

It can be divided in two parts, 20216 and 504, that multiplied together give a square (10188864 = 3192²).

The spelling of 20216504 in words is "twenty million, two hundred sixteen thousand, five hundred four".