20655535 has 4 divisors (see below), whose sum is σ = 24786648. Its totient is φ = 16524424.

The previous prime is 20655529. The next prime is 20655553. The reversal of 20655535 is 53555602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53555602 = 2 ⋅26777801.

It is a cyclic number.

It is not a de Polignac number, because 20655535 - 2⁹ = 20655023 is a prime.

It is a super-2 number, since 2×20655535² = 853302252272450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20655497 and 20655506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065549 + ... + 2065558.

It is an arithmetic number, because the mean of its divisors is an integer number (6196662).

Almost surely, 2^20655535 is an apocalyptic number.

20655535 is a deficient number, since it is larger than the sum of its proper divisors (4131113).

20655535 is an equidigital number, since it uses as much as digits as its factorization.

20655535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131112.

The product of its (nonzero) digits is 22500, while the sum is 31.

The square root of 20655535 is about 4544.8360806524. The cubic root of 20655535 is about 274.3755971054.

The spelling of 20655535 in words is "twenty million, six hundred fifty-five thousand, five hundred thirty-five".