22001320 has 64 divisors (see below), whose sum is σ = 55779840. Its totient is φ = 7737600.

The previous prime is 22001303. The next prime is 22001321. The reversal of 22001320 is 2310022.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 22001297 and 22001306.

It is not an unprimeable number, because it can be changed into a prime (22001321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12834 + ... + 14446.

It is an arithmetic number, because the mean of its divisors is an integer number (871560).

Almost surely, 2^22001320 is an apocalyptic number.

22001320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22001320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27889920).

22001320 is an abundant number, since it is smaller than the sum of its proper divisors (33778520).

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

22001320 is a wasteful number, since it uses less digits than its factorization.

22001320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666 (or 1662 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 22001320 is about 4690.5564701856. The cubic root of 22001320 is about 280.2095370321.

Adding to 22001320 its reverse (2310022), we get a palindrome (24311342).

The spelling of 22001320 in words is "twenty-two million, one thousand, three hundred twenty".