20913335 has 4 divisors (see below), whose sum is σ = 25096008. Its totient is φ = 16730664.

The previous prime is 20913329. The next prime is 20913359. The reversal of 20913335 is 53331902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20913335 - 2⁶ = 20913271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2091329 + ... + 2091338.

It is an arithmetic number, because the mean of its divisors is an integer number (6274002).

Almost surely, 2^20913335 is an apocalyptic number.

20913335 is a deficient number, since it is larger than the sum of its proper divisors (4182673).

20913335 is an equidigital number, since it uses as much as digits as its factorization.

20913335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4182672.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 20913335 is about 4573.1099921170. The cubic root of 20913335 is about 275.5123671028.

The spelling of 20913335 in words is "twenty million, nine hundred thirteen thousand, three hundred thirty-five".