20555269899264 has 297 divisors, whose sum is σ = 60182374836493. Its totient is φ = 6757308678144.

The previous prime is 20555269899209. The next prime is 20555269899287. The reversal of 20555269899264 is 46299896255502.

The square root of 20555269899264 is 4533792.

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

20555269899264 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 526 + 9 + 8 + 9 + 92 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3387837809664 + 17167432089600 = 1840608^2 + 4143360^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20555269899192 and 20555269899201.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 36125254372 + ... + 36125254940.

Almost surely, 2^{20555269899264} is an apocalyptic number.

20555269899264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

20555269899264 is the 4533792-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20555269899264

20555269899264 is an abundant number, since it is smaller than the sum of its proper divisors (39627104937229).

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

20555269899264 is an frugal number, since it uses more digits than its factorization.

20555269899264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 839808000, while the sum is 72.

The spelling of 20555269899264 in words is "twenty trillion, five hundred fifty-five billion, two hundred sixty-nine million, eight hundred ninety-nine thousand, two hundred sixty-four".