20323541515521 has 8 divisors (see below), whose sum is σ = 27098127372960. Its totient is φ = 13548991667552.

The previous prime is 20323541515489. The next prime is 20323541515583. The reversal of 20323541515521 is 12551514532302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20323541515521 - 2⁵ = 20323541515489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20323541515521.

It is not an unprimeable number, because it can be changed into a prime (20323541515721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7656711 + ... + 9963548.

It is an arithmetic number, because the mean of its divisors is an integer number (3387265921620).

Almost surely, 2^{20323541515521} is an apocalyptic number.

It is an amenable number.

20323541515521 is a deficient number, since it is larger than the sum of its proper divisors (6774585857439).

20323541515521 is a wasteful number, since it uses less digits than its factorization.

20323541515521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18004735.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 20323541515521 in words is "twenty trillion, three hundred twenty-three billion, five hundred forty-one million, five hundred fifteen thousand, five hundred twenty-one".