20331115643461 has 32 divisors (see below), whose sum is σ = 23896575521280. Its totient is φ = 16937164198656.

The previous prime is 20331115643413. The next prime is 20331115643471. The reversal of 20331115643461 is 16434651113302.

It is a cyclic number.

It is not a de Polignac number, because 20331115643461 - 2⁴³ = 11535022621253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331115643471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185843400 + ... + 185952766.

It is an arithmetic number, because the mean of its divisors is an integer number (746767985040).

Almost surely, 2^{20331115643461} is an apocalyptic number.

It is an amenable number.

20331115643461 is a deficient number, since it is larger than the sum of its proper divisors (3565459877819).

20331115643461 is a wasteful number, since it uses less digits than its factorization.

20331115643461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114133.

The product of its (nonzero) digits is 155520, while the sum is 40.

Adding to 20331115643461 its reverse (16434651113302), we get a palindrome (36765766756763).

The spelling of 20331115643461 in words is "twenty trillion, three hundred thirty-one billion, one hundred fifteen million, six hundred forty-three thousand, four hundred sixty-one".