20472402261 has 16 divisors (see below), whose sum is σ = 27568521344. Its totient is φ = 13512343104.

The previous prime is 20472402173. The next prime is 20472402317. The reversal of 20472402261 is 16220427402.

It is not a de Polignac number, because 20472402261 - 2¹⁰ = 20472401237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472402161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1971495 + ... + 1981851.

It is an arithmetic number, because the mean of its divisors is an integer number (1723032584).

Almost surely, 2^20472402261 is an apocalyptic number.

It is an amenable number.

20472402261 is a deficient number, since it is larger than the sum of its proper divisors (7096119083).

20472402261 is a wasteful number, since it uses less digits than its factorization.

20472402261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16860.

The product of its (nonzero) digits is 10752, while the sum is 30.

Adding to 20472402261 its reverse (16220427402), we get a palindrome (36692829663).

The spelling of 20472402261 in words is "twenty billion, four hundred seventy-two million, four hundred two thousand, two hundred sixty-one".