20315144 has 8 divisors (see below), whose sum is σ = 38090910. Its totient is φ = 10157568.

The previous prime is 20315143. The next prime is 20315147. The reversal of 20315144 is 44151302.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 2992900 = 4162^2 + 1730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269689 + ... + 1269704.

Almost surely, 2^20315144 is an apocalyptic number.

It is an amenable number.

20315144 is a deficient number, since it is larger than the sum of its proper divisors (17775766).

20315144 is a wasteful number, since it uses less digits than its factorization.

20315144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539399 (or 2539395 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20315144 is about 4507.2324102491. The cubic root of 20315144 is about 272.8600587861.

Adding to 20315144 its reverse (44151302), we get a palindrome (64466446).

The spelling of 20315144 in words is "twenty million, three hundred fifteen thousand, one hundred forty-four".