20190685 has 8 divisors (see below), whose sum is σ = 24639840. Its totient is φ = 15878544.

The previous prime is 20190631. The next prime is 20190719. The reversal of 20190685 is 58609102.

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

It is a cyclic number.

It is not a de Polignac number, because 20190685 - 2⁷ = 20190557 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 33927 + ... + 34516.

It is an arithmetic number, because the mean of its divisors is an integer number (3079980).

Almost surely, 2^20190685 is an apocalyptic number.

It is an amenable number.

20190685 is a deficient number, since it is larger than the sum of its proper divisors (4449155).

20190685 is an equidigital number, since it uses as much as digits as its factorization.

20190685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68507.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20190685 is about 4493.4046112052. The cubic root of 20190685 is about 272.3016990086.

Adding to 20190685 its reverse (58609102), we get a palindrome (78799787).

The spelling of 20190685 in words is "twenty million, one hundred ninety thousand, six hundred eighty-five".