20011044505 has 16 divisors (see below), whose sum is σ = 25441773840. Its totient is φ = 15057672192.

The previous prime is 20011044503. The next prime is 20011044523. The reversal of 20011044505 is 50544011002.

It can be written as a sum of positive squares in 8 ways, for example, as 8271538704 + 11739505801 = 90948^2 + 108349^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011044505 - 2¹ = 20011044503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011044503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63607 + ... + 209923.

It is an arithmetic number, because the mean of its divisors is an integer number (1590110865).

Almost surely, 2^20011044505 is an apocalyptic number.

It is an amenable number.

20011044505 is a deficient number, since it is larger than the sum of its proper divisors (5430729335).

20011044505 is a wasteful number, since it uses less digits than its factorization.

20011044505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147948.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 20011044505 its reverse (50544011002), we get a palindrome (70555055507).

The spelling of 20011044505 in words is "twenty billion, eleven million, forty-four thousand, five hundred five".