20616620571 has 6 divisors (see below), whose sum is σ = 29779563060. Its totient is φ = 13744413708.

The previous prime is 20616620551. The next prime is 20616620581. The reversal of 20616620571 is 17502661602.

It is a happy number.

20616620571 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 66 + 20 + 571 = 666.

It is not a de Polignac number, because 20616620571 - 2¹⁹ = 20616096283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20616620551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1145367801 + ... + 1145367818.

It is an arithmetic number, because the mean of its divisors is an integer number (4963260510).

Almost surely, 2^20616620571 is an apocalyptic number.

20616620571 is a deficient number, since it is larger than the sum of its proper divisors (9162942489).

20616620571 is a wasteful number, since it uses less digits than its factorization.

20616620571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290735625 (or 2290735622 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 20616620571 in words is "twenty billion, six hundred sixteen million, six hundred twenty thousand, five hundred seventy-one".