22220040 has 32 divisors (see below), whose sum is σ = 66660480. Its totient is φ = 5925312.

The previous prime is 22220027. The next prime is 22220041. The reversal of 22220040 is 4002222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 22219998 and 22220025.

It is not an unprimeable number, because it can be changed into a prime (22220041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92464 + ... + 92703.

It is an arithmetic number, because the mean of its divisors is an integer number (2083140).

Almost surely, 2^22220040 is an apocalyptic number.

22220040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22220040 is an abundant number, since it is smaller than the sum of its proper divisors (44440440).

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

22220040 is a wasteful number, since it uses less digits than its factorization.

22220040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185181 (or 185177 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 22220040 is about 4713.8137426080. The cubic root of 22220040 is about 281.1350186785.

Adding to 22220040 its reverse (4002222), we get a palindrome (26222262).

The spelling of 22220040 in words is "twenty-two million, two hundred twenty thousand, forty".