20555245 has 8 divisors (see below), whose sum is σ = 25964640. Its totient is φ = 15578640.

The previous prime is 20555243. The next prime is 20555251. The reversal of 20555245 is 54255502.

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

It is not a de Polignac number, because 20555245 - 2¹ = 20555243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108091 + ... + 108280.

It is an arithmetic number, because the mean of its divisors is an integer number (3245580).

Almost surely, 2^20555245 is an apocalyptic number.

It is an amenable number.

20555245 is a deficient number, since it is larger than the sum of its proper divisors (5409395).

20555245 is a wasteful number, since it uses less digits than its factorization.

20555245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216395.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 20555245 is about 4533.7892540346. The cubic root of 20555245 is about 273.9308126232.

The spelling of 20555245 in words is "twenty million, five hundred fifty-five thousand, two hundred forty-five".