20315124133 has 4 divisors (see below), whose sum is σ = 20864181580. Its totient is φ = 19766066688.

The previous prime is 20315124127. The next prime is 20315124191. The reversal of 20315124133 is 33142151302.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14987146084 + 5327978049 = 122422^2 + 72993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20315124133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20315124098 and 20315124107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315124733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274528668 + ... + 274528741.

It is an arithmetic number, because the mean of its divisors is an integer number (5216045395).

Almost surely, 2^20315124133 is an apocalyptic number.

It is an amenable number.

20315124133 is a deficient number, since it is larger than the sum of its proper divisors (549057447).

20315124133 is an equidigital number, since it uses as much as digits as its factorization.

20315124133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549057446.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20315124133 its reverse (33142151302), we get a palindrome (53457275435).

The spelling of 20315124133 in words is "twenty billion, three hundred fifteen million, one hundred twenty-four thousand, one hundred thirty-three".