20635345 has 4 divisors (see below), whose sum is σ = 24762420. Its totient is φ = 16508272.

The previous prime is 20635343. The next prime is 20635357. The reversal of 20635345 is 54353602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2076481 + 18558864 = 1441^2 + 4308^2 .

It is a cyclic number.

It is not a de Polignac number, because 20635345 - 2¹ = 20635343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20635343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063530 + ... + 2063539.

It is an arithmetic number, because the mean of its divisors is an integer number (6190605).

Almost surely, 2^20635345 is an apocalyptic number.

It is an amenable number.

20635345 is a deficient number, since it is larger than the sum of its proper divisors (4127075).

20635345 is an equidigital number, since it uses as much as digits as its factorization.

20635345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4127074.

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 20635345 is about 4542.6143353800. The cubic root of 20635345 is about 274.2861707246.

Adding to 20635345 its reverse (54353602), we get a palindrome (74988947).

The spelling of 20635345 in words is "twenty million, six hundred thirty-five thousand, three hundred forty-five".