20475188766 has 48 divisors (see below), whose sum is σ = 46763308800. Its totient is φ = 6456778704.

The previous prime is 20475188759. The next prime is 20475188831. The reversal of 20475188766 is 66788157402.

20475188766 is a `hidden beast` number, since 2 + 0 + 47 + 518 + 87 + 6 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204265 + ... + 287531.

It is an arithmetic number, because the mean of its divisors is an integer number (974235600).

Almost surely, 2^20475188766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20475188766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23381654400).

20475188766 is an abundant number, since it is smaller than the sum of its proper divisors (26288120034).

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

20475188766 is a wasteful number, since it uses less digits than its factorization.

20475188766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84013 (or 84010 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 20475188766 in words is "twenty billion, four hundred seventy-five million, one hundred eighty-eight thousand, seven hundred sixty-six".