22640340 has 24 divisors (see below), whose sum is σ = 63393120. Its totient is φ = 6037408.

The previous prime is 22640339. The next prime is 22640347. The reversal of 22640340 is 4304622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22640347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188610 + ... + 188729.

It is an arithmetic number, because the mean of its divisors is an integer number (2641380).

Almost surely, 2^22640340 is an apocalyptic number.

22640340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22640340 is an abundant number, since it is smaller than the sum of its proper divisors (40752780).

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

22640340 is a wasteful number, since it uses less digits than its factorization.

22640340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377351 (or 377349 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 22640340 is about 4758.1866293789. The cubic root of 22640340 is about 282.8965480688.

Adding to 22640340 its reverse (4304622), we get a palindrome (26944962).

The spelling of 22640340 in words is "twenty-two million, six hundred forty thousand, three hundred forty".