20111001 has 8 divisors (see below), whose sum is σ = 26854464. Its totient is φ = 13387440.

The previous prime is 20110997. The next prime is 20111011. The reversal of 20111001 is 10011102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111001 - 2² = 20110997 is a prime.

It is a super-2 number, since 2×20111001² = 808904722444002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20111011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2430 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (3356808).

Almost surely, 2^20111001 is an apocalyptic number.

It is an amenable number.

20111001 is a deficient number, since it is larger than the sum of its proper divisors (6743463).

20111001 is an equidigital number, since it uses as much as digits as its factorization.

20111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9951.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 20111001 is about 4484.5290722661. The cubic root of 20111001 is about 271.9430072704.

Adding to 20111001 its reverse (10011102), we get a palindrome (30122103).

Multiplying 20111001 by its reverse (10011102), we get a palindrome (201333282333102).

The spelling of 20111001 in words is "twenty million, one hundred eleven thousand, one".