20145728277 has 12 divisors (see below), whose sum is σ = 29202213664. Its totient is φ = 13383026280.

The previous prime is 20145728219. The next prime is 20145728303. The reversal of 20145728277 is 77282754102.

20145728277 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 572 + 8 + 2 + 77 = 666.

It is not a de Polignac number, because 20145728277 - 2¹⁰ = 20145727253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145728677) 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 11 ways as a sum of consecutive naturals, for example, 3952249 + ... + 3957342.

Almost surely, 2^20145728277 is an apocalyptic number.

It is an amenable number.

20145728277 is a deficient number, since it is larger than the sum of its proper divisors (9056485387).

20145728277 is a wasteful number, since it uses less digits than its factorization.

20145728277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909880 (or 7909877 counting only the distinct ones).

The product of its (nonzero) digits is 439040, while the sum is 45.

The spelling of 20145728277 in words is "twenty billion, one hundred forty-five million, seven hundred twenty-eight thousand, two hundred seventy-seven".