20280332350161 has 27 divisors (see below), whose sum is σ = 31720794537627. Its totient is φ = 12480096442320.

The previous prime is 20280332350147. The next prime is 20280332350169. The reversal of 20280332350161 is 16105323308202.

The square root of 20280332350161 is 4503369.

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

20280332350161 is a `hidden beast` number, since 2 + 0 + 280 + 3 + 323 + 50 + 1 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3000049164225 + 17280283185936 = 1732065^2 + 4156956^2 .

It is not a de Polignac number, because 20280332350161 - 2²⁹ = 20279795479249 is a prime.

It is a super-2 number, since 2×20280332350161² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20280332350169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 175573656 + ... + 175689126.

Almost surely, 2^{20280332350161} is an apocalyptic number.

20280332350161 is the 4503369-th square number.

20280332350161 is the 2251685-th centered octagonal number.

It is an amenable number.

20280332350161 is a deficient number, since it is larger than the sum of its proper divisors (11440462187466).

20280332350161 is an frugal number, since it uses more digits than its factorization.

20280332350161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230974 (or 115487 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Multiplying 20280332350161 by its sum of digits (36), we get a square (730091964605796 = 27020214²).

Adding to 20280332350161 its reverse (16105323308202), we get a palindrome (36385655658363).

The spelling of 20280332350161 in words is "twenty trillion, two hundred eighty billion, three hundred thirty-two million, three hundred fifty thousand, one hundred sixty-one".