20001111009975 has 72 divisors (see below), whose sum is σ = 36975156117120. Its totient is φ = 10329943440960.

The previous prime is 20001111009967. The next prime is 20001111009977. The reversal of 20001111009975 is 57990011110002.

It is not a de Polignac number, because 20001111009975 - 2³ = 20001111009967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001111009977) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10354419 + ... + 12133268.

It is an arithmetic number, because the mean of its divisors is an integer number (513543834960).

Almost surely, 2^{20001111009975} is an apocalyptic number.

20001111009975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20001111009975 is a deficient number, since it is larger than the sum of its proper divisors (16974045107145).

20001111009975 is a wasteful number, since it uses less digits than its factorization.

20001111009975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22487829 (or 22487821 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 36.

Adding to 20001111009975 its reverse (57990011110002), we get a palindrome (77991122119977).

The spelling of 20001111009975 in words is "twenty trillion, one billion, one hundred eleven million, nine thousand, nine hundred seventy-five".