20106565405 has 8 divisors (see below), whose sum is σ = 24366768984. Its totient is φ = 15925992000.

The previous prime is 20106565343. The next prime is 20106565411. The reversal of 20106565405 is 50456560102.

It can be written as a sum of positive squares in 4 ways, for example, as 11538841561 + 8567723844 = 107419^2 + 92562^2 .

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

It is not a de Polignac number, because 20106565405 - 2⁷ = 20106565277 is a prime.

It is a Duffinian number.

It is a congruent 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, 19906986 + ... + 19907995.

It is an arithmetic number, because the mean of its divisors is an integer number (3045846123).

Almost surely, 2^20106565405 is an apocalyptic number.

It is an amenable number.

20106565405 is a deficient number, since it is larger than the sum of its proper divisors (4260203579).

20106565405 is a wasteful number, since it uses less digits than its factorization.

20106565405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39815087.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 20106565405 in words is "twenty billion, one hundred six million, five hundred sixty-five thousand, four hundred five".