20683527561 has 24 divisors (see below), whose sum is σ = 31763399616. Its totient is φ = 12940630560.

The previous prime is 20683527551. The next prime is 20683527563. The reversal of 20683527561 is 16572538602.

20683527561 is a `hidden beast` number, since 2 + 0 + 6 + 83 + 5 + 2 + 7 + 561 = 666.

It is not a de Polignac number, because 20683527561 - 2⁹ = 20683527049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20683527563) 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, 931675 + ... + 953616.

It is an arithmetic number, because the mean of its divisors is an integer number (1323474984).

Almost surely, 2^20683527561 is an apocalyptic number.

It is an amenable number.

20683527561 is a deficient number, since it is larger than the sum of its proper divisors (11079872055).

20683527561 is a wasteful number, since it uses less digits than its factorization.

20683527561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885373 (or 1885370 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20683527561 in words is "twenty billion, six hundred eighty-three million, five hundred twenty-seven thousand, five hundred sixty-one".