20001220011 has 24 divisors (see below), whose sum is σ = 29640414960. Its totient is φ = 12992103936.

The previous prime is 20001220009. The next prime is 20001220051. The reversal of 20001220011 is 11002210002.

It is not a de Polignac number, because 20001220011 - 2¹ = 20001220009 is a prime.

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

20001220011 is a modest number, since divided by 220011 gives 20001 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20001219975 and 20001220002.

It is not an unprimeable number, because it can be changed into a prime (20001220051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106666 + ... + 226671.

It is an arithmetic number, because the mean of its divisors is an integer number (1235017290).

Almost surely, 2^20001220011 is an apocalyptic number.

20001220011 is a deficient number, since it is larger than the sum of its proper divisors (9639194949).

20001220011 is a wasteful number, since it uses less digits than its factorization.

20001220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333515 (or 333512 counting only the distinct ones).

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

Adding to 20001220011 its reverse (11002210002), we get a palindrome (31003430013).

The spelling of 20001220011 in words is "twenty billion, one million, two hundred twenty thousand, eleven".