22771540 has 48 divisors (see below), whose sum is σ = 52799040. Its totient is φ = 8180480.

The previous prime is 22771537. The next prime is 22771559. The reversal of 22771540 is 4517722.

It is a junction number, because it is equal to n+sod(n) for n = 22771499 and 22771508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18999 + ... + 20161.

It is an arithmetic number, because the mean of its divisors is an integer number (1099980).

Almost surely, 2^22771540 is an apocalyptic number.

22771540 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 22771540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26399520).

22771540 is an abundant number, since it is smaller than the sum of its proper divisors (30027500).

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

22771540 is a wasteful number, since it uses less digits than its factorization.

22771540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 22771540 is about 4771.9534783985. The cubic root of 22771540 is about 283.4419545080.

The spelling of 22771540 in words is "twenty-two million, seven hundred seventy-one thousand, five hundred forty".