22009700 has 36 divisors (see below), whose sum is σ = 48317220. Its totient is φ = 8701440.

The previous prime is 22009699. The next prime is 22009711. The reversal of 22009700 is 790022.

It can be written as a sum of positive squares in 6 ways, for example, as 702244 + 21307456 = 838^2 + 4616^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7664 + ... + 10136.

It is an arithmetic number, because the mean of its divisors is an integer number (1342145).

Almost surely, 2^22009700 is an apocalyptic number.

22009700 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 22009700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24158610).

22009700 is an abundant number, since it is smaller than the sum of its proper divisors (26307520).

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

22009700 is a wasteful number, since it uses less digits than its factorization.

22009700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 22009700 is about 4691.4496693453. The cubic root of 22009700 is about 280.2451085017.

Adding to 22009700 its reverse (790022), we get a palindrome (22799722).

The spelling of 22009700 in words is "twenty-two million, nine thousand, seven hundred".