22420008 has 96 divisors (see below), whose sum is σ = 69287400. Its totient is φ = 6488064.

The previous prime is 22420003. The next prime is 22420033. The reversal of 22420008 is 80002422.

It can be written as a sum of positive squares in 4 ways, for example, as 11410884 + 11009124 = 3378^2 + 3318^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22420003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15208 + ... + 16616.

Almost surely, 2^22420008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22420008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34643700).

22420008 is an abundant number, since it is smaller than the sum of its proper divisors (46867392).

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

22420008 is a wasteful number, since it uses less digits than its factorization.

22420008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451 (or 1444 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 22420008 is about 4734.9770854778. The cubic root of 22420008 is about 281.9758542779.

The spelling of 22420008 in words is "twenty-two million, four hundred twenty thousand, eight".