22491660 has 48 divisors (see below), whose sum is σ = 63183456. Its totient is φ = 5978112.

The previous prime is 22491653. The next prime is 22491683. The reversal of 22491660 is 6619422.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 33084 + ... + 33756.

It is an arithmetic number, because the mean of its divisors is an integer number (1316322).

Almost surely, 2^22491660 is an apocalyptic number.

22491660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22491660 is an abundant number, since it is smaller than the sum of its proper divisors (40691796).

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

22491660 is a wasteful number, since it uses less digits than its factorization.

22491660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 22491660 is about 4742.5372955835. The cubic root of 22491660 is about 282.2759232849.

The spelling of 22491660 in words is "twenty-two million, four hundred ninety-one thousand, six hundred sixty".