20534305 has 12 divisors (see below), whose sum is σ = 27085716. Its totient is φ = 14933600.

The previous prime is 20534303. The next prime is 20534329. The reversal of 20534305 is 50343502.

It can be written as a sum of positive squares in 2 ways, for example, as 8755681 + 11778624 = 2959^2 + 3432^2 .

It is not a de Polignac number, because 20534305 - 2¹ = 20534303 is a prime.

It is a super-3 number, since 3×20534305³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20534303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16366 + ... + 17575.

It is an arithmetic number, because the mean of its divisors is an integer number (2257143).

Almost surely, 2^20534305 is an apocalyptic number.

It is an amenable number.

20534305 is a deficient number, since it is larger than the sum of its proper divisors (6551411).

20534305 is a wasteful number, since it uses less digits than its factorization.

20534305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33968 (or 33957 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 20534305 is about 4531.4793390238. The cubic root of 20534305 is about 273.8377615934.

Adding to 20534305 its reverse (50343502), we get a palindrome (70877807).

The spelling of 20534305 in words is "twenty million, five hundred thirty-four thousand, three hundred five".