20910693 has 8 divisors (see below), whose sum is σ = 27907488. Its totient is φ = 13927184.

The previous prime is 20910671. The next prime is 20910713. The reversal of 20910693 is 39601902.

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 20910693 - 2⁸ = 20910437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20910693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20910293) by changing a digit.

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, 1255 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (3488436).

Almost surely, 2^20910693 is an apocalyptic number.

It is an amenable number.

20910693 is a deficient number, since it is larger than the sum of its proper divisors (6996795).

20910693 is a wasteful number, since it uses less digits than its factorization.

20910693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6643.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20910693 is about 4572.8211204901. The cubic root of 20910693 is about 275.5007647077.

The spelling of 20910693 in words is "twenty million, nine hundred ten thousand, six hundred ninety-three".