20886205 has 8 divisors (see below), whose sum is σ = 25105752. Its totient is φ = 16680768.

The previous prime is 20886199. The next prime is 20886209. The reversal of 20886205 is 50268802.

It can be written as a sum of positive squares in 4 ways, for example, as 582169 + 20304036 = 763^2 + 4506^2 .

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 20886205 - 2¹⁹ = 20361917 is a prime.

It is a super-3 number, since 3×20886205³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20886209) 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, 67 + ... + 6463.

It is an arithmetic number, because the mean of its divisors is an integer number (3138219).

Almost surely, 2^20886205 is an apocalyptic number.

It is an amenable number.

20886205 is a deficient number, since it is larger than the sum of its proper divisors (4219547).

20886205 is an equidigital number, since it uses as much as digits as its factorization.

20886205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20886205 is about 4570.1427767631. The cubic root of 20886205 is about 275.3931786355.

It can be divided in two parts, 20 and 886205, that multiplied together give a square (17724100 = 4210²).

The spelling of 20886205 in words is "twenty million, eight hundred eighty-six thousand, two hundred five".