22644340 has 24 divisors (see below), whose sum is σ = 50351112. Its totient is φ = 8524800.

The previous prime is 22644337. The next prime is 22644361. The reversal of 22644340 is 4344622.

It can be written as a sum of positive squares in 4 ways, for example, as 7806436 + 14837904 = 2794^2 + 3852^2 .

It is a super-2 number, since 2×22644340² = 1025532268071200, which contains 22 as substring.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32961 + ... + 33640.

It is an arithmetic number, because the mean of its divisors is an integer number (2097963).

Almost surely, 2^22644340 is an apocalyptic number.

22644340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22644340 is an abundant number, since it is smaller than the sum of its proper divisors (27706772).

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

22644340 is a wasteful number, since it uses less digits than its factorization.

22644340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66627 (or 66625 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 22644340 is about 4758.6069390106. The cubic root of 22644340 is about 282.9132074117.

Adding to 22644340 its reverse (4344622), we get a palindrome (26988962).

The spelling of 22644340 in words is "twenty-two million, six hundred forty-four thousand, three hundred forty".