20406054665 has 8 divisors (see below), whose sum is σ = 24488084808. Its totient is φ = 16324297600.

The previous prime is 20406054611. The next prime is 20406054671. The reversal of 20406054665 is 56645060402.

It can be written as a sum of positive squares in 4 ways, for example, as 795973369 + 19610081296 = 28213^2 + 140036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20406054665 - 2³⁴ = 3226185481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174839 + ... + 267171.

It is an arithmetic number, because the mean of its divisors is an integer number (3061010601).

Almost surely, 2^20406054665 is an apocalyptic number.

It is an amenable number.

20406054665 is a deficient number, since it is larger than the sum of its proper divisors (4082030143).

20406054665 is an equidigital number, since it uses as much as digits as its factorization.

20406054665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136539.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 20406054665 in words is "twenty billion, four hundred six million, fifty-four thousand, six hundred sixty-five".