20001011 has 4 divisors (see below), whose sum is σ = 20010192. Its totient is φ = 19991832.

The previous prime is 20001001. The next prime is 20001019. The reversal of 20001011 is 11010002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11010002 = 2 ⋅5505001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000986 and 20001004.

It is not an unprimeable number, because it can be changed into a prime (20001019) 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, 746 + ... + 6368.

It is an arithmetic number, because the mean of its divisors is an integer number (5002548).

Almost surely, 2^20001011 is an apocalyptic number.

20001011 is a deficient number, since it is larger than the sum of its proper divisors (9181).

20001011 is an equidigital number, since it uses as much as digits as its factorization.

20001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9180.

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

The square root of 20001011 is about 4472.2489868074. The cubic root of 20001011 is about 271.4463353761.

Adding to 20001011 its reverse (11010002), we get a palindrome (31011013).

Multiplying 20001011 by its reverse (11010002), we get a palindrome (220211171112022).

The spelling of 20001011 in words is "twenty million, one thousand, eleven".