20010111 has 16 divisors (see below), whose sum is σ = 29377920.
Its totient is φ = 12013920.
The previous prime is 20010079. The next prime is 20010127. The reversal of 20010111 is 11101002.
It is not a de Polignac number, because 20010111 - 25 = 20010079 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 20010111.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20010811) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816 + ... + 6378.
It is an arithmetic number, because the mean of its divisors is an integer number (1836120).
Almost surely, 220010111 is an apocalyptic number.
20010111 is a deficient number, since it is larger than the sum of its proper divisors (9367809).
20010111 is a wasteful number, since it uses less digits than its factorization.
20010111 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5686.
The product of its (nonzero) digits is 2, while the sum is 6.
The square root of 20010111 is about 4473.2662563277.
The cubic root of 20010111 is about 271.4874964142.
Adding to 20010111 its reverse (11101002), we get a palindrome (31111113).
Multiplying 20010111 by its reverse (11101002), we get a palindrome (222132282231222).
The spelling of 20010111 in words is "twenty million, ten thousand, one hundred eleven".