20113385 has 32 divisors (see below), whose sum is σ = 26922240. Its totient is φ = 14370048.

The previous prime is 20113367. The next prime is 20113391. The reversal of 20113385 is 58331102.

It is a cyclic number.

It is not a de Polignac number, because 20113385 - 2¹⁰ = 20112361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 20113385.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123314 + ... + 123476.

It is an arithmetic number, because the mean of its divisors is an integer number (841320).

Almost surely, 2^20113385 is an apocalyptic number.

It is an amenable number.

20113385 is a deficient number, since it is larger than the sum of its proper divisors (6808855).

20113385 is a wasteful number, since it uses less digits than its factorization.

20113385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20113385 is about 4484.7948671037. The cubic root of 20113385 is about 271.9537524096.

Adding to 20113385 its reverse (58331102), we get a palindrome (78444487).

The spelling of 20113385 in words is "twenty million, one hundred thirteen thousand, three hundred eighty-five".