20535345 has 24 divisors (see below), whose sum is σ = 36182952. Its totient is φ = 10771200.

The previous prime is 20535323. The next prime is 20535349. The reversal of 20535345 is 54353502.

It can be written as a sum of positive squares in 4 ways, for example, as 1034289 + 19501056 = 1017^2 + 4416^2 .

It is not a de Polignac number, because 20535345 - 2⁷ = 20535217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20535349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 996 + ... + 6485.

It is an arithmetic number, because the mean of its divisors is an integer number (1507623).

Almost surely, 2^20535345 is an apocalyptic number.

It is an amenable number.

20535345 is a deficient number, since it is larger than the sum of its proper divisors (15647607).

20535345 is a wasteful number, since it uses less digits than its factorization.

20535345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7553 (or 7550 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 20535345 is about 4531.5940903836. The cubic root of 20535345 is about 273.8423845315.

Adding to 20535345 its reverse (54353502), we get a palindrome (74888847).

The spelling of 20535345 in words is "twenty million, five hundred thirty-five thousand, three hundred forty-five".