20216364 has 96 divisors (see below), whose sum is σ = 57361920. Its totient is φ = 5419008.

The previous prime is 20216359. The next prime is 20216369. The reversal of 20216364 is 46361202.

It is an interprime number because it is at equal distance from previous prime (20216359) and next prime (20216369).

It is not an unprimeable number, because it can be changed into a prime (20216369) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104652 + ... + 104844.

It is an arithmetic number, because the mean of its divisors is an integer number (597520).

Almost surely, 2^20216364 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 20216364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28680960).

20216364 is an abundant number, since it is smaller than the sum of its proper divisors (37145556).

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

20216364 is a wasteful number, since it uses less digits than its factorization.

20216364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20216364 is about 4496.2611134141. The cubic root of 20216364 is about 272.4170900588.

Adding to 20216364 its reverse (46361202), we get a palindrome (66577566).

It can be divided in two parts, 2021 and 6364, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 20216364 in words is "twenty million, two hundred sixteen thousand, three hundred sixty-four".