20955535 has 8 divisors (see below), whose sum is σ = 25958016. Its totient is φ = 16223520.

The previous prime is 20955503. The next prime is 20955559. The reversal of 20955535 is 53555902.

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

It is not a de Polignac number, because 20955535 - 2⁵ = 20955503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20955535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67444 + ... + 67753.

It is an arithmetic number, because the mean of its divisors is an integer number (3244752).

Almost surely, 2^20955535 is an apocalyptic number.

20955535 is a deficient number, since it is larger than the sum of its proper divisors (5002481).

20955535 is a wasteful number, since it uses less digits than its factorization.

20955535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135233.

The product of its (nonzero) digits is 33750, while the sum is 34.

The square root of 20955535 is about 4577.7215948548. The cubic root of 20955535 is about 275.6975569252.

The spelling of 20955535 in words is "twenty million, nine hundred fifty-five thousand, five hundred thirty-five".