20144786 has 4 divisors (see below), whose sum is σ = 30217182. Its totient is φ = 10072392.

The previous prime is 20144777. The next prime is 20144797. The reversal of 20144786 is 68744102.

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

It can be written as a sum of positive squares in only one way, i.e., 14969161 + 5175625 = 3869^2 + 2275^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5036195 + ... + 5036198.

Almost surely, 2^20144786 is an apocalyptic number.

20144786 is a deficient number, since it is larger than the sum of its proper divisors (10072396).

20144786 is a wasteful number, since it uses less digits than its factorization.

20144786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072395.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20144786 is about 4488.2943308121. The cubic root of 20144786 is about 272.0952034816.

Adding to 20144786 its reverse (68744102), we get a palindrome (88888888).

The spelling of 20144786 in words is "twenty million, one hundred forty-four thousand, seven hundred eighty-six".