20315124 has 30 divisors (see below), whose sum is σ = 53108594. Its totient is φ = 6771600.

The previous prime is 20315117. The next prime is 20315129. The reversal of 20315124 is 42151302.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 3175524 = 4140^2 + 1782^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20315097 and 20315106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31027 + ... + 31674.

Almost surely, 2^20315124 is an apocalyptic number.

It is an amenable number.

20315124 is an abundant number, since it is smaller than the sum of its proper divisors (32793470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20315124 is a wasteful number, since it uses less digits than its factorization.

20315124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62717 (or 62706 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20315124 is about 4507.2301915922. The cubic root of 20315124 is about 272.8599692437.

Adding to 20315124 its reverse (42151302), we get a palindrome (62466426).

The spelling of 20315124 in words is "twenty million, three hundred fifteen thousand, one hundred twenty-four".