22320520 has 32 divisors (see below), whose sum is σ = 50359320. Its totient is φ = 8903680.

The previous prime is 22320503. The next prime is 22320559. The reversal of 22320520 is 2502322.

It can be written as a sum of positive squares in 4 ways, for example, as 19766916 + 2553604 = 4446^2 + 1598^2 .

It is a super-3 number, since 3×22320520³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 22320494 and 22320503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23250 + ... + 24190.

Almost surely, 2^22320520 is an apocalyptic number.

22320520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22320520 is an abundant number, since it is smaller than the sum of its proper divisors (28038800).

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

22320520 is a wasteful number, since it uses less digits than its factorization.

22320520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1541 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 22320520 is about 4724.4597574749. The cubic root of 22320520 is about 281.5581498263.

Adding to 22320520 its reverse (2502322), we get a palindrome (24822842).

The spelling of 22320520 in words is "twenty-two million, three hundred twenty thousand, five hundred twenty".