20651571606 has 32 divisors (see below), whose sum is σ = 41845735008. Its totient is φ = 6793862400.

The previous prime is 20651571587. The next prime is 20651571643. The reversal of 20651571606 is 60617515602.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135240 + ... + 244116.

It is an arithmetic number, because the mean of its divisors is an integer number (1307679219).

Almost surely, 2^20651571606 is an apocalyptic number.

20651571606 is an abundant number, since it is smaller than the sum of its proper divisors (21194163402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20651571606 is a wasteful number, since it uses less digits than its factorization.

20651571606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109296.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 20651571606 in words is "twenty billion, six hundred fifty-one million, five hundred seventy-one thousand, six hundred six".