20135385 has 40 divisors (see below), whose sum is σ = 36590400. Its totient is φ = 10591776.

The previous prime is 20135377. The next prime is 20135431. The reversal of 20135385 is 58353102.

It is not a de Polignac number, because 20135385 - 2³ = 20135377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33316 + ... + 33914.

It is an arithmetic number, because the mean of its divisors is an integer number (914760).

Almost surely, 2^20135385 is an apocalyptic number.

It is an amenable number.

20135385 is a deficient number, since it is larger than the sum of its proper divisors (16455015).

20135385 is an equidigital number, since it uses as much as digits as its factorization.

20135385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20135385 is about 4487.2469287972. The cubic root of 20135385 is about 272.0528705256.

Adding to 20135385 its reverse (58353102), we get a palindrome (78488487).

The spelling of 20135385 in words is "twenty million, one hundred thirty-five thousand, three hundred eighty-five".