22440820 has 12 divisors (see below), whose sum is σ = 47125764. Its totient is φ = 8976320.

The previous prime is 22440763. The next prime is 22440841. The reversal of 22440820 is 2804422.

It can be written as a sum of positive squares in 2 ways, for example, as 6022116 + 16418704 = 2454^2 + 4052^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22440791 and 22440800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561001 + ... + 561040.

It is an arithmetic number, because the mean of its divisors is an integer number (3927147).

Almost surely, 2^22440820 is an apocalyptic number.

22440820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22440820 is an abundant number, since it is smaller than the sum of its proper divisors (24684944).

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

22440820 is a wasteful number, since it uses less digits than its factorization.

22440820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122050 (or 1122048 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 22440820 is about 4737.1742632080. The cubic root of 22440820 is about 282.0630779541.

The spelling of 22440820 in words is "twenty-two million, four hundred forty thousand, eight hundred twenty".