20501205 has 8 divisors (see below), whose sum is σ = 32801952. Its totient is φ = 10933968.

The previous prime is 20501203. The next prime is 20501207. The reversal of 20501205 is 50210502.

It is an interprime number because it is at equal distance from previous prime (20501203) and next prime (20501207).

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

It is not a de Polignac number, because 20501205 - 2¹ = 20501203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1366747 = 20501205 / (2 + 0 + 5 + 0 + 1 + 2 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501203) 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, 683359 + ... + 683388.

It is an arithmetic number, because the mean of its divisors is an integer number (4100244).

Almost surely, 2^20501205 is an apocalyptic number.

It is an amenable number.

20501205 is a deficient number, since it is larger than the sum of its proper divisors (12300747).

20501205 is a wasteful number, since it uses less digits than its factorization.

20501205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366755.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 20501205 is about 4527.8256371022. The cubic root of 20501205 is about 273.6905460844.

Adding to 20501205 its reverse (50210502), we get a palindrome (70711707).

It can be divided in two parts, 20501 and 205, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20501205 in words is "twenty million, five hundred one thousand, two hundred five".