20899380269056 has 117 divisors (see below), whose sum is σ = 42526348162389. Its totient is φ = 10269606297600.

The previous prime is 20899380269051. The next prime is 20899380269063. The reversal of 20899380269056 is 65096208399802.

The square root of 20899380269056 is 4571584.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 679608979456 + 20219771289600 = 824384^2 + 4496640^2 .

It is a super-2 number, since 2×20899380269056² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20899380268982 and 20899380269000.

It is not an unprimeable number, because it can be changed into a prime (20899380269051) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17847463351 + ... + 17847464521.

It is an arithmetic number, because the mean of its divisors is an integer number (363473061217).

Almost surely, 2^{20899380269056} is an apocalyptic number.

20899380269056 is the 4571584-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20899380269056

20899380269056 is an abundant number, since it is smaller than the sum of its proper divisors (21626967893333).

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

20899380269056 is an frugal number, since it uses more digits than its factorization.

20899380269056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 67.

The spelling of 20899380269056 in words is "twenty trillion, eight hundred ninety-nine billion, three hundred eighty million, two hundred sixty-nine thousand, fifty-six".