22003540 has 24 divisors (see below), whose sum is σ = 49762440. Its totient is φ = 8124288.

The previous prime is 22003529. The next prime is 22003589. The reversal of 22003540 is 4530022.

It can be written as a sum of positive squares in 4 ways, for example, as 3992004 + 18011536 = 1998^2 + 4244^2 .

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, 42055 + ... + 42574.

It is an arithmetic number, because the mean of its divisors is an integer number (2073435).

Almost surely, 2^22003540 is an apocalyptic number.

22003540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22003540 is an abundant number, since it is smaller than the sum of its proper divisors (27758900).

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

22003540 is a wasteful number, since it uses less digits than its factorization.

22003540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84651 (or 84649 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 22003540 is about 4690.7931099122. The cubic root of 22003540 is about 280.2189613795.

Adding to 22003540 its reverse (4530022), we get a palindrome (26533562).

The spelling of 22003540 in words is "twenty-two million, three thousand, five hundred forty".