190820785 has 8 divisors (see below), whose sum is σ = 229335336. Its totient is φ = 152423040.

The previous prime is 190820771. The next prime is 190820789. The reversal of 190820785 is 587028091.

190820785 = T₄₀₅ + T₄₀₆ + ... + T₁₀₆₅.

It can be written as a sum of positive squares in 4 ways, for example, as 12117361 + 178703424 = 3481^2 + 13368^2 .

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

It is not a de Polignac number, because 190820785 - 2⁵ = 190820753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190820789) by changing a digit.

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, 25564 + ... + 32173.

It is an arithmetic number, because the mean of its divisors is an integer number (28666917).

Almost surely, 2^190820785 is an apocalyptic number.

It is an amenable number.

190820785 is a deficient number, since it is larger than the sum of its proper divisors (38514551).

190820785 is an equidigital number, since it uses as much as digits as its factorization.

190820785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58403.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 190820785 is about 13813.7896682988. The cubic root of 190820785 is about 575.7163447501.

The spelling of 190820785 in words is "one hundred ninety million, eight hundred twenty thousand, seven hundred eighty-five".