21944580 has 48 divisors (see below), whose sum is σ = 70224000. Its totient is φ = 5015808.

The previous prime is 21944579. The next prime is 21944581. The reversal of 21944580 is 8544912.

It is an interprime number because it is at equal distance from previous prime (21944579) and next prime (21944581).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944581) 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 15 ways as a sum of consecutive naturals, for example, 25705 + ... + 26544.

It is an arithmetic number, because the mean of its divisors is an integer number (1463000).

Almost surely, 2^21944580 is an apocalyptic number.

21944580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21944580 is an abundant number, since it is smaller than the sum of its proper divisors (48279420).

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

21944580 is a wasteful number, since it uses less digits than its factorization.

21944580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52268 (or 52266 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 21944580 is about 4684.5042427134. The cubic root of 21944580 is about 279.9684488258.

The spelling of 21944580 in words is "twenty-one million, nine hundred forty-four thousand, five hundred eighty".