20018287705 has 32 divisors (see below), whose sum is σ = 27569009664. Its totient is φ = 13839108096.

The previous prime is 20018287561. The next prime is 20018287721. The reversal of 20018287705 is 50778281002.

It is not a de Polignac number, because 20018287705 - 2¹³ = 20018279513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 72184 + ... + 212713.

It is an arithmetic number, because the mean of its divisors is an integer number (861531552).

Almost surely, 2^20018287705 is an apocalyptic number.

It is an amenable number.

20018287705 is a deficient number, since it is larger than the sum of its proper divisors (7550721959).

20018287705 is a wasteful number, since it uses less digits than its factorization.

20018287705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284985.

The product of its (nonzero) digits is 62720, while the sum is 40.

The spelling of 20018287705 in words is "twenty billion, eighteen million, two hundred eighty-seven thousand, seven hundred five".