20355245 has 8 divisors (see below), whose sum is σ = 25268760. Its totient is φ = 15722560.

The previous prime is 20355241. The next prime is 20355271. The reversal of 20355245 is 54255302.

It can be written as a sum of positive squares in 4 ways, for example, as 5900041 + 14455204 = 2429^2 + 3802^2 .

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

It is not a de Polignac number, because 20355245 - 2² = 20355241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355241) by changing a digit.

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, 70046 + ... + 70335.

It is an arithmetic number, because the mean of its divisors is an integer number (3158595).

Almost surely, 2^20355245 is an apocalyptic number.

It is an amenable number.

20355245 is a deficient number, since it is larger than the sum of its proper divisors (4913515).

20355245 is a wasteful number, since it uses less digits than its factorization.

20355245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140415.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 20355245 is about 4511.6787341299. The cubic root of 20355245 is about 273.0394778030.

The spelling of 20355245 in words is "twenty million, three hundred fifty-five thousand, two hundred forty-five".