22315220 has 24 divisors (see below), whose sum is σ = 49619304. Its totient is φ = 8400896.

The previous prime is 22315217. The next prime is 22315231. The reversal of 22315220 is 2251322.

It can be written as a sum of positive squares in 4 ways, for example, as 6980164 + 15335056 = 2642^2 + 3916^2 .

It is a super-3 number, since 3×22315220³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

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, 32477 + ... + 33156.

It is an arithmetic number, because the mean of its divisors is an integer number (2067471).

Almost surely, 2^22315220 is an apocalyptic number.

22315220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22315220 is an abundant number, since it is smaller than the sum of its proper divisors (27304084).

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

22315220 is a wasteful number, since it uses less digits than its factorization.

22315220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65659 (or 65657 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 22315220 is about 4723.8988134802. The cubic root of 22315220 is about 281.5358627660.

Adding to 22315220 its reverse (2251322), we get a palindrome (24566542).

The spelling of 22315220 in words is "twenty-two million, three hundred fifteen thousand, two hundred twenty".