20539726245 has 24 divisors (see below), whose sum is σ = 35607930072. Its totient is φ = 10952755200.

The previous prime is 20539726243. The next prime is 20539726283. The reversal of 20539726245 is 54262793502.

20539726245 is a `hidden beast` number, since 2 + 0 + 539 + 72 + 6 + 2 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3597840324 + 16941885921 = 59982^2 + 130161^2 .

It is not a de Polignac number, because 20539726245 - 2¹ = 20539726243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20539726245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539726243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274485 + ... + 341205.

It is an arithmetic number, because the mean of its divisors is an integer number (1483663753).

Almost surely, 2^20539726245 is an apocalyptic number.

It is an amenable number.

20539726245 is a deficient number, since it is larger than the sum of its proper divisors (15068203827).

20539726245 is a wasteful number, since it uses less digits than its factorization.

20539726245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73573 (or 73570 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 20539726245 in words is "twenty billion, five hundred thirty-nine million, seven hundred twenty-six thousand, two hundred forty-five".