20621576106496 has 80 divisors (see below), whose sum is σ = 42048805706424. Its totient is φ = 10099733889024.

The previous prime is 20621576106479. The next prime is 20621576106503. The reversal of 20621576106496 is 69460167512602.

It can be written as a sum of positive squares in 4 ways, for example, as 11313804960000 + 9307771146496 = 3363600^2 + 3050864^2 .

It is a super-3 number, since 3×20621576106496³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16014520 + ... + 17254216.

Almost surely, 2^{20621576106496} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20621576106496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21024402853212).

20621576106496 is an abundant number, since it is smaller than the sum of its proper divisors (21427229599928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20621576106496 is an equidigital number, since it uses as much as digits as its factorization.

20621576106496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240381 (or 1240365 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 20621576106496 in words is "twenty trillion, six hundred twenty-one billion, five hundred seventy-six million, one hundred six thousand, four hundred ninety-six".