20693893 has 4 divisors (see below), whose sum is σ = 22575168. Its totient is φ = 18812620.

The previous prime is 20693891. The next prime is 20693909. The reversal of 20693893 is 39839602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20693893 - 2¹ = 20693891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20693891) 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 3 ways as a sum of consecutive naturals, for example, 940621 + ... + 940642.

It is an arithmetic number, because the mean of its divisors is an integer number (5643792).

Almost surely, 2^20693893 is an apocalyptic number.

It is an amenable number.

20693893 is a deficient number, since it is larger than the sum of its proper divisors (1881275).

20693893 is a wasteful number, since it uses less digits than its factorization.

20693893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881274.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20693893 is about 4549.0540774979. The cubic root of 20693893 is about 274.5453335479.

The spelling of 20693893 in words is "twenty million, six hundred ninety-three thousand, eight hundred ninety-three".