20006771775 has 12 divisors (see below), whose sum is σ = 33077862792. Its totient is φ = 10670278240.

The previous prime is 20006771773. The next prime is 20006771779. The reversal of 20006771775 is 57717760002.

It is a happy number.

It is not a de Polignac number, because 20006771775 - 2¹ = 20006771773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006771773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133378404 + ... + 133378553.

It is an arithmetic number, because the mean of its divisors is an integer number (2756488566).

Almost surely, 2^20006771775 is an apocalyptic number.

20006771775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20006771775 is a deficient number, since it is larger than the sum of its proper divisors (13071091017).

20006771775 is a wasteful number, since it uses less digits than its factorization.

20006771775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266756970 (or 266756965 counting only the distinct ones).

The product of its (nonzero) digits is 144060, while the sum is 42.

The spelling of 20006771775 in words is "twenty billion, six million, seven hundred seventy-one thousand, seven hundred seventy-five".