20144686 has 4 divisors (see below), whose sum is σ = 30217032. Its totient is φ = 10072342.

The previous prime is 20144671. The next prime is 20144737. The reversal of 20144686 is 68644102.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5036170 + ... + 5036173.

It is an arithmetic number, because the mean of its divisors is an integer number (7554258).

Almost surely, 2^20144686 is an apocalyptic number.

20144686 is a deficient number, since it is larger than the sum of its proper divisors (10072346).

20144686 is a wasteful number, since it uses less digits than its factorization.

20144686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10072345.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20144686 is about 4488.2831907089. The cubic root of 20144686 is about 272.0947532483.

Adding to 20144686 its reverse (68644102), we get a palindrome (88788788).

The spelling of 20144686 in words is "twenty million, one hundred forty-four thousand, six hundred eighty-six".