205098820381 has 32 divisors (see below), whose sum is σ = 267531683328. Its totient is φ = 152585441280.

The previous prime is 205098820379. The next prime is 205098820397. The reversal of 205098820381 is 183028890502.

It is a cyclic number.

It is not a de Polignac number, because 205098820381 - 2¹ = 205098820379 is a prime.

It is a super-2 number, since 2×205098820381² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205098820331) 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, 1582101 + ... + 1706821.

It is an arithmetic number, because the mean of its divisors is an integer number (8360365104).

Almost surely, 2^205098820381 is an apocalyptic number.

It is an amenable number.

205098820381 is a deficient number, since it is larger than the sum of its proper divisors (62432862947).

205098820381 is a wasteful number, since it uses less digits than its factorization.

205098820381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125821.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 205098820381 in words is "two hundred five billion, ninety-eight million, eight hundred twenty thousand, three hundred eighty-one".