20441987 has 4 divisors (see below), whose sum is σ = 20688360. Its totient is φ = 20195616.

The previous prime is 20441983. The next prime is 20441999. The reversal of 20441987 is 78914402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20441987 - 2² = 20441983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20441983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123062 + ... + 123227.

It is an arithmetic number, because the mean of its divisors is an integer number (5172090).

Almost surely, 2^20441987 is an apocalyptic number.

20441987 is a deficient number, since it is larger than the sum of its proper divisors (246373).

20441987 is an equidigital number, since it uses as much as digits as its factorization.

20441987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246372.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20441987 is about 4521.2815661049. The cubic root of 20441987 is about 273.4267723704.

The spelling of 20441987 in words is "twenty million, four hundred forty-one thousand, nine hundred eighty-seven".