20734205 has 16 divisors (see below), whose sum is σ = 25508784. Its totient is φ = 16174080.

The previous prime is 20734199. The next prime is 20734229. The reversal of 20734205 is 50243702.

It can be written as a sum of positive squares in 8 ways, for example, as 8637721 + 12096484 = 2939^2 + 3478^2 .

It is not a de Polignac number, because 20734205 - 2⁶ = 20734141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47669 + ... + 48101.

It is an arithmetic number, because the mean of its divisors is an integer number (1594299).

Almost surely, 2^20734205 is an apocalyptic number.

It is an amenable number.

20734205 is a deficient number, since it is larger than the sum of its proper divisors (4774579).

20734205 is a wasteful number, since it uses less digits than its factorization.

20734205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20734205 is about 4553.4827330297. The cubic root of 20734205 is about 274.7234906613.

Adding to 20734205 its reverse (50243702), we get a palindrome (70977907).

The spelling of 20734205 in words is "twenty million, seven hundred thirty-four thousand, two hundred five".