20993335 has 8 divisors (see below), whose sum is σ = 27482256. Its totient is φ = 15267840.

The previous prime is 20993281. The next prime is 20993339. The reversal of 20993335 is 53339902.

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

It is not a de Polignac number, because 20993335 - 2⁷ = 20993207 is a prime.

It is a super-2 number, since 2×20993335² = 881440228844450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20993335.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190794 + ... + 190903.

It is an arithmetic number, because the mean of its divisors is an integer number (3435282).

Almost surely, 2^20993335 is an apocalyptic number.

20993335 is a deficient number, since it is larger than the sum of its proper divisors (6488921).

20993335 is a wasteful number, since it uses less digits than its factorization.

20993335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381713.

The product of its (nonzero) digits is 21870, while the sum is 34.

The square root of 20993335 is about 4581.8484261267. The cubic root of 20993335 is about 275.8632268836.

The spelling of 20993335 in words is "twenty million, nine hundred ninety-three thousand, three hundred thirty-five".