22351620 has 96 divisors (see below), whose sum is σ = 65995776. Its totient is φ = 5644800.

The previous prime is 22351597. The next prime is 22351621. The reversal of 22351620 is 2615322.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22351621) 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, 113362 + ... + 113558.

It is an arithmetic number, because the mean of its divisors is an integer number (687456).

Almost surely, 2^22351620 is an apocalyptic number.

22351620 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 22351620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32997888).

22351620 is an abundant number, since it is smaller than the sum of its proper divisors (43644156).

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

22351620 is a wasteful number, since it uses less digits than its factorization.

22351620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 22351620 is about 4727.7499933901. The cubic root of 22351620 is about 281.6888575742.

Adding to 22351620 its reverse (2615322), we get a palindrome (24966942).

The spelling of 22351620 in words is "twenty-two million, three hundred fifty-one thousand, six hundred twenty".