22220020 has 24 divisors (see below), whose sum is σ = 49407624. Its totient is φ = 8365056.

The previous prime is 22219999. The next prime is 22220027. The reversal of 22220020 is 2002222.

It can be written as a sum of positive squares in 4 ways, for example, as 9072144 + 13147876 = 3012^2 + 3626^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 22219979 and 22220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220027) 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, 32337 + ... + 33016.

It is an arithmetic number, because the mean of its divisors is an integer number (2058651).

Almost surely, 2^22220020 is an apocalyptic number.

22220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22220020 is an abundant number, since it is smaller than the sum of its proper divisors (27187604).

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

22220020 is a wasteful number, since it uses less digits than its factorization.

22220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65379 (or 65377 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 22220020 is about 4713.8116211830. The cubic root of 22220020 is about 281.1349343297.

Adding to 22220020 its reverse (2002222), we get a palindrome (24222242).

The spelling of 22220020 in words is "twenty-two million, two hundred twenty thousand, twenty".