20011100013 has 6 divisors (see below), whose sum is σ = 28904922254. Its totient is φ = 13340733336.

The previous prime is 20011099981. The next prime is 20011100023. The reversal of 20011100013 is 31000111002.

It can be written as a sum of positive squares in only one way, i.e., 15430111524 + 4580988489 = 124218^2 + 67683^2 .

It is not a de Polignac number, because 20011100013 - 2⁵ = 20011099981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2223455557 = 20011100013 / (2 + 0 + 0 + 1 + 1 + 1 + 0 + 0 + 0 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011099968 and 20011100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011100023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111727770 + ... + 1111727787.

Almost surely, 2^20011100013 is an apocalyptic number.

It is an amenable number.

20011100013 is a deficient number, since it is larger than the sum of its proper divisors (8893822241).

20011100013 is a wasteful number, since it uses less digits than its factorization.

20011100013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223455563 (or 2223455560 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 20011100013 its reverse (31000111002), we get a palindrome (51011211015).

The spelling of 20011100013 in words is "twenty billion, eleven million, one hundred thousand, thirteen".