20505335 has 8 divisors (see below), whose sum is σ = 24943920. Its totient is φ = 16179264.

The previous prime is 20505307. The next prime is 20505341. The reversal of 20505335 is 53350502.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20505335 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20505335.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27725 + ... + 28454.

It is an arithmetic number, because the mean of its divisors is an integer number (3117990).

Almost surely, 2^20505335 is an apocalyptic number.

20505335 is a deficient number, since it is larger than the sum of its proper divisors (4438585).

20505335 is an equidigital number, since it uses as much as digits as its factorization.

20505335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56257.

The product of its (nonzero) digits is 2250, while the sum is 23.

The square root of 20505335 is about 4528.2816829345. The cubic root of 20505335 is about 273.7089233141.

Adding to 20505335 its reverse (53350502), we get a palindrome (73855837).

The spelling of 20505335 in words is "twenty million, five hundred five thousand, three hundred thirty-five".