20477206505 has 32 divisors (see below), whose sum is σ = 28216472064. Its totient is φ = 13974944256.

The previous prime is 20477206499. The next prime is 20477206507. The reversal of 20477206505 is 50560277402.

It is a happy number.

It is not a de Polignac number, because 20477206505 - 2⁸ = 20477206249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20477206507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10592519 + ... + 10594451.

It is an arithmetic number, because the mean of its divisors is an integer number (881764752).

Almost surely, 2^20477206505 is an apocalyptic number.

It is an amenable number.

20477206505 is a deficient number, since it is larger than the sum of its proper divisors (7739265559).

20477206505 is a wasteful number, since it uses less digits than its factorization.

20477206505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225.

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 20477206505 in words is "twenty billion, four hundred seventy-seven million, two hundred six thousand, five hundred five".