20406507475 has 6 divisors (see below), whose sum is σ = 25304069300. Its totient is φ = 16325205960.

The previous prime is 20406507439. The next prime is 20406507487. The reversal of 20406507475 is 57470560402.

It is not a de Polignac number, because 20406507475 - 2²⁷ = 20272289747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408130125 + ... + 408130174.

Almost surely, 2^20406507475 is an apocalyptic number.

20406507475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20406507475 is a deficient number, since it is larger than the sum of its proper divisors (4897561825).

20406507475 is an equidigital number, since it uses as much as digits as its factorization.

20406507475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816260309 (or 816260304 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The spelling of 20406507475 in words is "twenty billion, four hundred six million, five hundred seven thousand, four hundred seventy-five".