20100220011 has 64 divisors (see below), whose sum is σ = 32598720000. Its totient is φ = 12190445568.

The previous prime is 20100220009. The next prime is 20100220081. The reversal of 20100220011 is 11002200102.

It is not a de Polignac number, because 20100220011 - 2¹ = 20100220009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20100219975 and 20100220002.

It is not an unprimeable number, because it can be changed into a prime (20100220081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1909240 + ... + 1919738.

It is an arithmetic number, because the mean of its divisors is an integer number (509355000).

Almost surely, 2^20100220011 is an apocalyptic number.

20100220011 is a deficient number, since it is larger than the sum of its proper divisors (12498499989).

20100220011 is a wasteful number, since it uses less digits than its factorization.

20100220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10665 (or 10659 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20100220011 its reverse (11002200102), we get a palindrome (31102420113).

The spelling of 20100220011 in words is "twenty billion, one hundred million, two hundred twenty thousand, eleven".