22019400 has 144 divisors (see below), whose sum is σ = 79721460. Its totient is φ = 5414400.

The previous prime is 22019383. The next prime is 22019411. The reversal of 22019400 is 491022.

It can be written as a sum of positive squares in 6 ways, for example, as 5225796 + 16793604 = 2286^2 + 4098^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22930 + ... + 23870.

Almost surely, 2^22019400 is an apocalyptic number.

22019400 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 22019400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39860730).

22019400 is an abundant number, since it is smaller than the sum of its proper divisors (57702060).

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

22019400 is a wasteful number, since it uses less digits than its factorization.

22019400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 22019400 is about 4692.4833510626. The cubic root of 22019400 is about 280.2862718419.

The spelling of 22019400 in words is "twenty-two million, nineteen thousand, four hundred".