20546642281 has 27 divisors (see below), whose sum is σ = 23006235063. Its totient is φ = 18336180720.

The previous prime is 20546642239. The next prime is 20546642293. The reversal of 20546642281 is 18224664502.

The square root of 20546642281 is 143341.

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., 6022536025 + 14524106256 = 77605^2 + 120516^2 .

It is not a de Polignac number, because 20546642281 - 2⁹ = 20546641769 is a prime.

It is a super-2 number, since 2×20546642281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20546642231) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 130870255 + ... + 130870411.

Almost surely, 2^20546642281 is an apocalyptic number.

20546642281 is the 143341-st square number.

20546642281 is the 71671-st centered octagonal number.

It is an amenable number.

20546642281 is a deficient number, since it is larger than the sum of its proper divisors (2459592782).

20546642281 is an frugal number, since it uses more digits than its factorization.

20546642281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 20546642281 in words is "twenty billion, five hundred forty-six million, six hundred forty-two thousand, two hundred eighty-one".