22145540 has 24 divisors (see below), whose sum is σ = 46654272. Its totient is φ = 8829920.

The previous prime is 22145537. The next prime is 22145549. The reversal of 22145540 is 4554122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22145549) 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, 5345 + ... + 8535.

It is an arithmetic number, because the mean of its divisors is an integer number (1943928).

Almost surely, 2^22145540 is an apocalyptic number.

22145540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22145540 is an abundant number, since it is smaller than the sum of its proper divisors (24508732).

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

22145540 is a wasteful number, since it uses less digits than its factorization.

22145540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547 (or 3545 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 22145540 is about 4705.9048014170. The cubic root of 22145540 is about 280.8204676330.

Adding to 22145540 its reverse (4554122), we get a palindrome (26699662).

The spelling of 22145540 in words is "twenty-two million, one hundred forty-five thousand, five hundred forty".