20815530024961 has 4 divisors (see below), whose sum is σ = 23789177171392. Its totient is φ = 17841882878532.

The previous prime is 20815530024901. The next prime is 20815530025001. The reversal of 20815530024961 is 16942003551802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20815530024961 - 2⁹ = 20815530024449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20815530024901) 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, 1486823573205 + ... + 1486823573218.

It is an arithmetic number, because the mean of its divisors is an integer number (5947294292848).

Almost surely, 2^{20815530024961} is an apocalyptic number.

It is an amenable number.

20815530024961 is a deficient number, since it is larger than the sum of its proper divisors (2973647146431).

20815530024961 is an equidigital number, since it uses as much as digits as its factorization.

20815530024961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973647146430.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 20815530024961 in words is "twenty trillion, eight hundred fifteen billion, five hundred thirty million, twenty-four thousand, nine hundred sixty-one".