20322816 has 80 divisors (see below), whose sum is σ = 55094688. Its totient is φ = 6656000.

The previous prime is 20322793. The next prime is 20322817. The reversal of 20322816 is 61822302.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20322817) 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, 155071 + ... + 155201.

Almost surely, 2^20322816 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 20322816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27547344).

20322816 is an abundant number, since it is smaller than the sum of its proper divisors (34771872).

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

20322816 is a wasteful number, since it uses less digits than its factorization.

20322816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20322816 is about 4508.0834065044. The cubic root of 20322816 is about 272.8944029336.

The spelling of 20322816 in words is "twenty million, three hundred twenty-two thousand, eight hundred sixteen".