20729314818 has 12 divisors (see below), whose sum is σ = 44913515478. Its totient is φ = 6909771600.

The previous prime is 20729314747. The next prime is 20729314819. The reversal of 20729314818 is 81841392702.

It is a happy number.

20729314818 is a `hidden beast` number, since 207 + 293 + 148 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19334068209 + 1395246609 = 139047^2 + 37353^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20729314819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575814283 + ... + 575814318.

Almost surely, 2^20729314818 is an apocalyptic number.

20729314818 is an abundant number, since it is smaller than the sum of its proper divisors (24184200660).

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

20729314818 is a wasteful number, since it uses less digits than its factorization.

20729314818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151628609 (or 1151628606 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

It can be divided in two parts, 207293 and 14818, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 20729314818 in words is "twenty billion, seven hundred twenty-nine million, three hundred fourteen thousand, eight hundred eighteen".