222240420 has 72 divisors (see below), whose sum is σ = 676952640. Its totient is φ = 59016000.

The previous prime is 222240419. The next prime is 222240443. The reversal of 222240420 is 24042222.

222240420 is a `hidden beast` number, since 2 + 2 + 2 + 240 + 420 = 666.

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 = 222240393 and 222240402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42721 + ... + 47639.

It is an arithmetic number, because the mean of its divisors is an integer number (9402120).

Almost surely, 2^222240420 is an apocalyptic number.

222240420 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 222240420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338476320).

222240420 is an abundant number, since it is smaller than the sum of its proper divisors (454712220).

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

222240420 is a wasteful number, since it uses less digits than its factorization.

222240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185 (or 5180 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 222240420 is about 14907.7302095255. The cubic root of 222240420 is about 605.7233976045.

Adding to 222240420 its reverse (24042222), we get a palindrome (246282642).

The spelling of 222240420 in words is "two hundred twenty-two million, two hundred forty thousand, four hundred twenty".