20535605 has 8 divisors (see below), whose sum is σ = 24694200. Its totient is φ = 16394176.

The previous prime is 20535601. The next prime is 20535607. The reversal of 20535605 is 50653502.

It can be written as a sum of positive squares in 4 ways, for example, as 303601 + 20232004 = 551^2 + 4498^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20535605 - 2² = 20535601 is a prime.

It is a super-2 number, since 2×20535605² = 843422145432050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (3086775).

Almost surely, 2^20535605 is an apocalyptic number.

It is an amenable number.

20535605 is a deficient number, since it is larger than the sum of its proper divisors (4158595).

20535605 is an equidigital number, since it uses as much as digits as its factorization.

20535605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8583.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 20535605 is about 4531.6227777696. The cubic root of 20535605 is about 273.8435402417.

The spelling of 20535605 in words is "twenty million, five hundred thirty-five thousand, six hundred five".