20525543361 has 6 divisors (see below), whose sum is σ = 29648007090. Its totient is φ = 13683695568.

The previous prime is 20525543327. The next prime is 20525543399. The reversal of 20525543361 is 16334552502.

20525543361 is a `hidden beast` number, since 2 + 0 + 5 + 255 + 43 + 361 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19840412736 + 685130625 = 140856^2 + 26175^2 .

It is not a de Polignac number, because 20525543361 - 2¹⁷ = 20525412289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20525545361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1140307956 + ... + 1140307973.

It is an arithmetic number, because the mean of its divisors is an integer number (4941334515).

Almost surely, 2^20525543361 is an apocalyptic number.

It is an amenable number.

20525543361 is a deficient number, since it is larger than the sum of its proper divisors (9122463729).

20525543361 is a wasteful number, since it uses less digits than its factorization.

20525543361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280615935 (or 2280615932 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 20525543361 in words is "twenty billion, five hundred twenty-five million, five hundred forty-three thousand, three hundred sixty-one".