20018100071 has 12 divisors (see below), whose sum is σ = 21238663992. Its totient is φ = 18861927216.

The previous prime is 20018100031. The next prime is 20018100079. The reversal of 20018100071 is 17000181002.

It is not a de Polignac number, because 20018100071 - 2⁶ = 20018100007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018100079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246956 + ... + 317841.

It is an arithmetic number, because the mean of its divisors is an integer number (1769888666).

Almost surely, 2^20018100071 is an apocalyptic number.

20018100071 is a deficient number, since it is larger than the sum of its proper divisors (1220563921).

20018100071 is an equidigital number, since it uses as much as digits as its factorization.

20018100071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564910 (or 564887 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 20018100071 its reverse (17000181002), we get a palindrome (37018281073).

The spelling of 20018100071 in words is "twenty billion, eighteen million, one hundred thousand, seventy-one".