22146640 has 20 divisors (see below), whose sum is σ = 51491124. Its totient is φ = 8858624.

The previous prime is 22146637. The next prime is 22146659. The reversal of 22146640 is 4664122.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 9784384 = 3516^2 + 3128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138337 + ... + 138496.

Almost surely, 2^22146640 is an apocalyptic number.

22146640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22146640 is an abundant number, since it is smaller than the sum of its proper divisors (29344484).

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

22146640 is a wasteful number, since it uses less digits than its factorization.

22146640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276846 (or 276840 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 22146640 is about 4706.0216744082. The cubic root of 22146640 is about 280.8251171381.

The spelling of 22146640 in words is "twenty-two million, one hundred forty-six thousand, six hundred forty".