20566770417 has 24 divisors (see below), whose sum is σ = 30982049280. Its totient is φ = 13132074240.

The previous prime is 20566770401. The next prime is 20566770421. The reversal of 20566770417 is 71407766502.

20566770417 is a `hidden beast` number, since 2 + 0 + 566 + 7 + 70 + 4 + 17 = 666.

It is not a de Polignac number, because 20566770417 - 2⁴ = 20566770401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20566770437) 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, 352917 + ... + 407042.

It is an arithmetic number, because the mean of its divisors is an integer number (1290918720).

Almost surely, 2^20566770417 is an apocalyptic number.

It is an amenable number.

20566770417 is a deficient number, since it is larger than the sum of its proper divisors (10415278863).

20566770417 is a wasteful number, since it uses less digits than its factorization.

20566770417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760093 (or 760090 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 20566770417 in words is "twenty billion, five hundred sixty-six million, seven hundred seventy thousand, four hundred seventeen".