20205786523 has 12 divisors (see below), whose sum is σ = 21906183360. Its totient is φ = 18628867296.

The previous prime is 20205786521. The next prime is 20205786539. The reversal of 20205786523 is 32568750202.

It is not a de Polignac number, because 20205786523 - 2¹ = 20205786521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20205786521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67990 + ... + 212212.

It is an arithmetic number, because the mean of its divisors is an integer number (1825515280).

Almost surely, 2^20205786523 is an apocalyptic number.

20205786523 is a deficient number, since it is larger than the sum of its proper divisors (1700396837).

20205786523 is a wasteful number, since it uses less digits than its factorization.

20205786523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145078 (or 145065 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 20205786523 in words is "twenty billion, two hundred five million, seven hundred eighty-six thousand, five hundred twenty-three".