20118783165 has 32 divisors (see below), whose sum is σ = 34738744320. Its totient is φ = 9883908096.

The previous prime is 20118783163. The next prime is 20118783203. The reversal of 20118783165 is 56138781102.

It is not a de Polignac number, because 20118783165 - 2¹ = 20118783163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20118783163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14292 + ... + 201101.

It is an arithmetic number, because the mean of its divisors is an integer number (1085585760).

Almost surely, 2^20118783165 is an apocalyptic number.

It is an amenable number.

20118783165 is a deficient number, since it is larger than the sum of its proper divisors (14619961155).

20118783165 is a wasteful number, since it uses less digits than its factorization.

20118783165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215893.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 20118783165 in words is "twenty billion, one hundred eighteen million, seven hundred eighty-three thousand, one hundred sixty-five".