22304520 has 192 divisors, whose sum is σ = 84913920. Its totient is φ = 4972032.

The previous prime is 22304483. The next prime is 22304551. The reversal of 22304520 is 2540322.

It is a super-2 number, since 2×22304520² = 994983224860800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22304493 and 22304502.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133477 + ... + 133643.

It is an arithmetic number, because the mean of its divisors is an integer number (442260).

Almost surely, 2^22304520 is an apocalyptic number.

22304520 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 22304520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42456960).

22304520 is an abundant number, since it is smaller than the sum of its proper divisors (62609400).

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

22304520 is a wasteful number, since it uses less digits than its factorization.

22304520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 22304520 is about 4722.7661386099. The cubic root of 22304520 is about 281.4908573789.

Adding to 22304520 its reverse (2540322), we get a palindrome (24844842).

The spelling of 22304520 in words is "twenty-two million, three hundred four thousand, five hundred twenty".