22320640 has 40 divisors (see below), whose sum is σ = 53523360. Its totient is φ = 8927232.

The previous prime is 22320637. The next prime is 22320653. The reversal of 22320640 is 4602322.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×22320640³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800 + ... + 6919.

It is an arithmetic number, because the mean of its divisors is an integer number (1338084).

Almost surely, 2^22320640 is an apocalyptic number.

22320640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22320640 is an abundant number, since it is smaller than the sum of its proper divisors (31202720).

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

22320640 is an frugal number, since it uses more digits than its factorization.

22320640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8742 (or 8726 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 22320640 is about 4724.4724573226. The cubic root of 22320640 is about 281.5586543981.

Adding to 22320640 its reverse (4602322), we get a palindrome (26922962).

The spelling of 22320640 in words is "twenty-two million, three hundred twenty thousand, six hundred forty".