20691734 has 16 divisors (see below), whose sum is σ = 35900928. Its totient is φ = 8760552.

The previous prime is 20691733. The next prime is 20691791. The reversal of 20691734 is 43719602.

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 20691734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7742 + ... + 10065.

It is an arithmetic number, because the mean of its divisors is an integer number (2243808).

Almost surely, 2^20691734 is an apocalyptic number.

20691734 is a deficient number, since it is larger than the sum of its proper divisors (15209194).

20691734 is a wasteful number, since it uses less digits than its factorization.

20691734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17899.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20691734 is about 4548.8167692269. The cubic root of 20691734 is about 274.5357854171.

The spelling of 20691734 in words is "twenty million, six hundred ninety-one thousand, seven hundred thirty-four".