20512144 has 10 divisors (see below), whose sum is σ = 39742310. Its totient is φ = 10256064.

The previous prime is 20512139. The next prime is 20512169. The reversal of 20512144 is 44121502.

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 262144 = 4500^2 + 512^2 .

It is a super-3 number, since 3×20512144³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 640989 + ... + 641020.

It is an arithmetic number, because the mean of its divisors is an integer number (3974231).

Almost surely, 2^20512144 is an apocalyptic number.

It is an amenable number.

20512144 is a deficient number, since it is larger than the sum of its proper divisors (19230166).

20512144 is a wasteful number, since it uses less digits than its factorization.

20512144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282017 (or 1282011 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20512144 is about 4529.0334509694. The cubic root of 20512144 is about 273.7392158829.

Adding to 20512144 its reverse (44121502), we get a palindrome (64633646).

The spelling of 20512144 in words is "twenty million, five hundred twelve thousand, one hundred forty-four".