20100011 has 4 divisors (see below), whose sum is σ = 20115000. Its totient is φ = 20085024.

The previous prime is 20099983. The next prime is 20100023. The reversal of 20100011 is 11000102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20100011 - 2²² = 15905707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20099968 and 20100004.

It is not an unprimeable number, because it can be changed into a prime (20100611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5261 + ... + 8238.

It is an arithmetic number, because the mean of its divisors is an integer number (5028750).

Almost surely, 2^20100011 is an apocalyptic number.

20100011 is a deficient number, since it is larger than the sum of its proper divisors (14989).

20100011 is a wasteful number, since it uses less digits than its factorization.

20100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14988.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 20100011 is about 4483.3035810661. The cubic root of 20100011 is about 271.8934622773.

Adding to 20100011 its reverse (11000102), we get a palindrome (31100113).

Subtracting from 20100011 its reverse (11000102), we obtain a palindrome (9099909).

Multiplying 20100011 by its reverse (11000102), we get a palindrome (221102171201122).

The spelling of 20100011 in words is "twenty million, one hundred thousand, eleven".