20216604 has 48 divisors (see below), whose sum is σ = 50446368. Its totient is φ = 6279168.

The previous prime is 20216593. The next prime is 20216633. The reversal of 20216604 is 40661202.

It is a happy number.

It is a super-2 number, since 2×20216604² = 817422154585632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 22614 + ... + 23490.

It is an arithmetic number, because the mean of its divisors is an integer number (1050966).

Almost surely, 2^20216604 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 20216604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25223184).

20216604 is an abundant number, since it is smaller than the sum of its proper divisors (30229764).

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

20216604 is a wasteful number, since it uses less digits than its factorization.

20216604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20216604 is about 4496.2878021764. The cubic root of 20216604 is about 272.4181680608.

Adding to 20216604 its reverse (40661202), we get a palindrome (60877806).

The spelling of 20216604 in words is "twenty million, two hundred sixteen thousand, six hundred four".