20257205 has 8 divisors (see below), whose sum is σ = 24432000. Its totient is φ = 16123536.

The previous prime is 20257169. The next prime is 20257213. The reversal of 20257205 is 50275202.

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 20257205 - 2⁸ = 20256949 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 9185 + ... + 11174.

It is an arithmetic number, because the mean of its divisors is an integer number (3054000).

Almost surely, 2^20257205 is an apocalyptic number.

It is an amenable number.

20257205 is a deficient number, since it is larger than the sum of its proper divisors (4174795).

20257205 is a wasteful number, since it uses less digits than its factorization.

20257205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20563.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 20257205 is about 4500.8004843583. The cubic root of 20257205 is about 272.6004118913.

The spelling of 20257205 in words is "twenty million, two hundred fifty-seven thousand, two hundred five".