205086838 has 32 divisors (see below), whose sum is σ = 345461760. Its totient is φ = 90504000.

The previous prime is 205086787. The next prime is 205086851. The reversal of 205086838 is 838680502.

It is a super-2 number, since 2×205086838² = 84121222241676488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205086838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244023 + ... + 244861.

It is an arithmetic number, because the mean of its divisors is an integer number (10795680).

Almost surely, 2^205086838 is an apocalyptic number.

205086838 is a deficient number, since it is larger than the sum of its proper divisors (140374922).

205086838 is a wasteful number, since it uses less digits than its factorization.

205086838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 205086838 is about 14320.8532567023. The cubic root of 205086838 is about 589.7200989677.

It can be divided in two parts, 2050 and 86838, that added together give a palindrome (88888).

The spelling of 205086838 in words is "two hundred five million, eighty-six thousand, eight hundred thirty-eight".