20018200181 has 32 divisors (see below), whose sum is σ = 23472599040. Its totient is φ = 16719483456.

The previous prime is 20018200159. The next prime is 20018200283. The reversal of 20018200181 is 18100281002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20018200181 - 2¹⁸ = 20017938037 is a prime.

It is a super-2 number, since 2×20018200181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018200141) 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, 22070330 + ... + 22071236.

It is an arithmetic number, because the mean of its divisors is an integer number (733518720).

Almost surely, 2^20018200181 is an apocalyptic number.

It is an amenable number.

20018200181 is a deficient number, since it is larger than the sum of its proper divisors (3454398859).

20018200181 is a wasteful number, since it uses less digits than its factorization.

20018200181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 20018200181 its reverse (18100281002), we get a palindrome (38118481183).

The spelling of 20018200181 in words is "twenty billion, eighteen million, two hundred thousand, one hundred eighty-one".