20767486818 has 128 divisors (see below), whose sum is σ = 48343680000. Its totient is φ = 5893772544.

The previous prime is 20767486811. The next prime is 20767486819. The reversal of 20767486818 is 81868476702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (20767486811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9529653 + ... + 9531831.

It is an arithmetic number, because the mean of its divisors is an integer number (377685000).

Almost surely, 2^20767486818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20767486818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24171840000).

20767486818 is an abundant number, since it is smaller than the sum of its proper divisors (27576193182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20767486818 is a wasteful number, since it uses less digits than its factorization.

20767486818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 7225344, while the sum is 57.

It can be divided in two parts, 207674 and 86818, that added together give a palindrome (294492).

The spelling of 20767486818 in words is "twenty billion, seven hundred sixty-seven million, four hundred eighty-six thousand, eight hundred eighteen".