20566141281 has 27 divisors (see below), whose sum is σ = 34561774611. Its totient is φ = 11750359824.

The previous prime is 20566141259. The next prime is 20566141301. The reversal of 20566141281 is 18214166502.

It is a happy number.

The square root of 20566141281 is 143409.

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

20566141281 is a `hidden beast` number, since 2 + 0 + 566 + 1 + 4 + 12 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11153260881 + 9412880400 = 105609^2 + 97020^2 .

It is not a de Polignac number, because 20566141281 - 2⁹ = 20566140769 is a prime.

It is a super-2 number, since 2×20566141281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20566141201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3008175 + ... + 3015003.

Almost surely, 2^20566141281 is an apocalyptic number.

20566141281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20566141281 is the 143409-th square number.

20566141281 is the 71705-th centered octagonal number.

It is an amenable number.

20566141281 is a deficient number, since it is larger than the sum of its proper divisors (13995633330).

20566141281 is an frugal number, since it uses more digits than its factorization.

20566141281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13678 (or 6839 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

Multiplying 20566141281 by its sum of digits (36), we get a square (740381086116 = 860454²).

The spelling of 20566141281 in words is "twenty billion, five hundred sixty-six million, one hundred forty-one thousand, two hundred eighty-one".