22715220 has 96 divisors (see below), whose sum is σ = 70189056. Its totient is φ = 5443200.

The previous prime is 22715201. The next prime is 22715221. The reversal of 22715220 is 2251722.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22715221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83685 + ... + 83955.

It is an arithmetic number, because the mean of its divisors is an integer number (731136).

Almost surely, 2^22715220 is an apocalyptic number.

22715220 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 22715220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35094528).

22715220 is an abundant number, since it is smaller than the sum of its proper divisors (47473836).

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

22715220 is a wasteful number, since it uses less digits than its factorization.

22715220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 22715220 is about 4766.0486778882. The cubic root of 22715220 is about 283.2080861268.

Adding to 22715220 its reverse (2251722), we get a palindrome (24966942).

The spelling of 22715220 in words is "twenty-two million, seven hundred fifteen thousand, two hundred twenty".