20155205 has 8 divisors (see below), whose sum is σ = 27641472. Its totient is φ = 13820688.

The previous prime is 20155169. The next prime is 20155249. The reversal of 20155205 is 50255102.

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

It is not a de Polignac number, because 20155205 - 2¹⁰ = 20154181 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 287897 + ... + 287966.

It is an arithmetic number, because the mean of its divisors is an integer number (3455184).

Almost surely, 2^20155205 is an apocalyptic number.

It is an amenable number.

20155205 is a deficient number, since it is larger than the sum of its proper divisors (7486267).

20155205 is an equidigital number, since it uses as much as digits as its factorization.

20155205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575875.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20155205 is about 4489.4548666848. The cubic root of 20155205 is about 272.1421051350.

The spelling of 20155205 in words is "twenty million, one hundred fifty-five thousand, two hundred five".