22157740 has 96 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 7392000.

The previous prime is 22157713. The next prime is 22157741. The reversal of 22157740 is 4775122.

It is a junction number, because it is equal to n+sod(n) for n = 22157699 and 22157708.

It is not an unprimeable number, because it can be changed into a prime (22157741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146665 + ... + 146815.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^22157740 is an apocalyptic number.

22157740 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 22157740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27578880).

22157740 is an abundant number, since it is smaller than the sum of its proper divisors (33000020).

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

22157740 is a wasteful number, since it uses less digits than its factorization.

22157740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 221 counting only the distinct ones).

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

The square root of 22157740 is about 4707.2008667572. The cubic root of 22157740 is about 280.8720262579.

The spelling of 22157740 in words is "twenty-two million, one hundred fifty-seven thousand, seven hundred forty".