22051540 has 48 divisors (see below), whose sum is σ = 54641664. Its totient is φ = 7315200.

The previous prime is 22051537. The next prime is 22051543. The reversal of 22051540 is 4515022.

It is an interprime number because it is at equal distance from previous prime (22051537) and next prime (22051543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22051543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800 + ... + 6880.

It is an arithmetic number, because the mean of its divisors is an integer number (1138368).

Almost surely, 2^22051540 is an apocalyptic number.

22051540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22051540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27320832).

22051540 is an abundant number, since it is smaller than the sum of its proper divisors (32590124).

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

22051540 is a wasteful number, since it uses less digits than its factorization.

22051540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128 (or 5126 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 22051540 is about 4695.9067282049. The cubic root of 22051540 is about 280.4225762125.

Adding to 22051540 its reverse (4515022), we get a palindrome (26566562).

The spelling of 22051540 in words is "twenty-two million, fifty-one thousand, five hundred forty".