206220415405 has 8 divisors (see below), whose sum is σ = 247501032984. Its totient is φ = 164951976000.

The previous prime is 206220415399. The next prime is 206220415421. The reversal of 206220415405 is 504514022602.

It can be written as a sum of positive squares in 4 ways, for example, as 5814672516 + 200405742889 = 76254^2 + 447667^2 .

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

It is not a de Polignac number, because 206220415405 - 2¹⁹ = 206219891117 is a prime.

It is a super-2 number, since 2×206220415405² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3007246 + ... + 3075055.

It is an arithmetic number, because the mean of its divisors is an integer number (30937629123).

Almost surely, 2^206220415405 is an apocalyptic number.

It is an amenable number.

206220415405 is a deficient number, since it is larger than the sum of its proper divisors (41280617579).

206220415405 is an equidigital number, since it uses as much as digits as its factorization.

206220415405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089087.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 206220415405 in words is "two hundred six billion, two hundred twenty million, four hundred fifteen thousand, four hundred five".