20709194 has 16 divisors (see below), whose sum is σ = 34140096. Its totient is φ = 9343200.

The previous prime is 20709133. The next prime is 20709203. The reversal of 20709194 is 49190702.

It is a super-2 number, since 2×20709194² = 857741432259272, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20709194.

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, 422 + ... + 6449.

It is an arithmetic number, because the mean of its divisors is an integer number (2133756).

Almost surely, 2^20709194 is an apocalyptic number.

20709194 is a deficient number, since it is larger than the sum of its proper divisors (13430902).

20709194 is a wasteful number, since it uses less digits than its factorization.

20709194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20709194 is about 4550.7355449422. The cubic root of 20709194 is about 274.6129828655.

Adding to 20709194 its reverse (49190702), we get a palindrome (69899896).

The spelling of 20709194 in words is "twenty million, seven hundred nine thousand, one hundred ninety-four".