20441551 has 4 divisors (see below), whose sum is σ = 22013992. Its totient is φ = 18869112.

The previous prime is 20441471. The next prime is 20441563. The reversal of 20441551 is 15514402.

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 20441551 - 2¹⁵ = 20408783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786201 + ... + 786226.

It is an arithmetic number, because the mean of its divisors is an integer number (5503498).

Almost surely, 2^20441551 is an apocalyptic number.

20441551 is a deficient number, since it is larger than the sum of its proper divisors (1572441).

20441551 is a wasteful number, since it uses less digits than its factorization.

20441551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572440.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 20441551 is about 4521.2333494302. The cubic root of 20441551 is about 273.4248284152.

Adding to 20441551 its reverse (15514402), we get a palindrome (35955953).

The spelling of 20441551 in words is "twenty million, four hundred forty-one thousand, five hundred fifty-one".