20144836 has 6 divisors (see below), whose sum is σ = 35253470. Its totient is φ = 10072416.

The previous prime is 20144833. The next prime is 20144837. The reversal of 20144836 is 63844102.

It can be written as a sum of positive squares in only one way, i.e., 10497600 + 9647236 = 3240^2 + 3106^2 .

It is not an unprimeable number, because it can be changed into a prime (20144833) by changing a digit.

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, 2518101 + ... + 2518108.

Almost surely, 2^20144836 is an apocalyptic number.

It is an amenable number.

20144836 is a deficient number, since it is larger than the sum of its proper divisors (15108634).

20144836 is a wasteful number, since it uses less digits than its factorization.

20144836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036213 (or 5036211 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20144836 is about 4488.2999008533. The cubic root of 20144836 is about 272.0954285978.

Adding to 20144836 its reverse (63844102), we get a palindrome (83988938).

The spelling of 20144836 in words is "twenty million, one hundred forty-four thousand, eight hundred thirty-six".