22161804 has 48 divisors (see below), whose sum is σ = 59447808. Its totient is φ = 6294528.

The previous prime is 22161803. The next prime is 22161823. The reversal of 22161804 is 40816122.

It is a super-2 number, since 2×22161804² = 982291113068832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15529 + ... + 16895.

It is an arithmetic number, because the mean of its divisors is an integer number (1238496).

Almost surely, 2^22161804 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 22161804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29723904).

22161804 is an abundant number, since it is smaller than the sum of its proper divisors (37286004).

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

22161804 is a wasteful number, since it uses less digits than its factorization.

22161804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 22161804 is about 4707.6325260156. The cubic root of 22161804 is about 280.8891969943.

Adding to 22161804 its reverse (40816122), we get a palindrome (62977926).

The spelling of 22161804 in words is "twenty-two million, one hundred sixty-one thousand, eight hundred four".