20441640 has 32 divisors (see below), whose sum is σ = 61325280. Its totient is φ = 5451072.

The previous prime is 20441639. The next prime is 20441651. The reversal of 20441640 is 4614402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85054 + ... + 85293.

It is an arithmetic number, because the mean of its divisors is an integer number (1916415).

Almost surely, 2^20441640 is an apocalyptic number.

20441640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20441640 is an abundant number, since it is smaller than the sum of its proper divisors (40883640).

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

20441640 is a wasteful number, since it uses less digits than its factorization.

20441640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170361 (or 170357 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20441640 is about 4521.2431918666. The cubic root of 20441640 is about 273.4252252340.

The spelling of 20441640 in words is "twenty million, four hundred forty-one thousand, six hundred forty".