20205706 has 8 divisors (see below), whose sum is σ = 30359844. Its totient is φ = 10085760.

The previous prime is 20205697. The next prime is 20205709. The reversal of 20205706 is 60750202.

It can be written as a sum of positive squares in 2 ways, for example, as 16933225 + 3272481 = 4115^2 + 1809^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20205709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7015 + ... + 9466.

Almost surely, 2^20205706 is an apocalyptic number.

20205706 is a deficient number, since it is larger than the sum of its proper divisors (10154138).

20205706 is a wasteful number, since it uses less digits than its factorization.

20205706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17096.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20205706 is about 4495.0757501960. The cubic root of 20205706 is about 272.3692091817.

Adding to 20205706 its reverse (60750202), we get a palindrome (80955908).

The spelling of 20205706 in words is "twenty million, two hundred five thousand, seven hundred six".