20555513321 has 8 divisors (see below), whose sum is σ = 23775052224. Its totient is φ = 17406733680.

The previous prime is 20555513243. The next prime is 20555513347. The reversal of 20555513321 is 12331555502.

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

It is not a de Polignac number, because 20555513321 - 2³⁰ = 19481771497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555513371) 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, 17689190 + ... + 17690351.

It is an arithmetic number, because the mean of its divisors is an integer number (2971881528).

Almost surely, 2^20555513321 is an apocalyptic number.

It is an amenable number.

20555513321 is a deficient number, since it is larger than the sum of its proper divisors (3219538903).

20555513321 is an equidigital number, since it uses as much as digits as its factorization.

20555513321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35379631.

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 20555513321 in words is "twenty billion, five hundred fifty-five million, five hundred thirteen thousand, three hundred twenty-one".