20144881 has 4 divisors (see below), whose sum is σ = 21329892. Its totient is φ = 18959872.

The previous prime is 20144869. The next prime is 20144903. The reversal of 20144881 is 18844102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12215025 + 7929856 = 3495^2 + 2816^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144881 - 2¹¹ = 20142833 is a prime.

It is a super-2 number, since 2×20144881² = 811632461008322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 592480 + ... + 592513.

It is an arithmetic number, because the mean of its divisors is an integer number (5332473).

Almost surely, 2^20144881 is an apocalyptic number.

It is an amenable number.

20144881 is a deficient number, since it is larger than the sum of its proper divisors (1185011).

20144881 is a wasteful number, since it uses less digits than its factorization.

20144881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185010.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 20144881 is about 4488.3049138845. The cubic root of 20144881 is about 272.0956312020.

Adding to 20144881 its reverse (18844102), we get a palindrome (38988983).

It can be divided in two parts, 20144 and 881, that added together give a square (21025 = 145²).

The spelling of 20144881 in words is "twenty million, one hundred forty-four thousand, eight hundred eighty-one".