20634356 has 12 divisors (see below), whose sum is σ = 36154692. Its totient is φ = 10304448.

The previous prime is 20634349. The next prime is 20634359. The reversal of 20634356 is 65343602.

It can be written as a sum of positive squares in 2 ways, for example, as 6451600 + 14182756 = 2540^2 + 3766^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634359) 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, 1106 + ... + 6518.

It is an arithmetic number, because the mean of its divisors is an integer number (3012891).

Almost surely, 2^20634356 is an apocalyptic number.

It is an amenable number.

20634356 is a deficient number, since it is larger than the sum of its proper divisors (15520336).

20634356 is a wasteful number, since it uses less digits than its factorization.

20634356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6370 (or 6368 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 20634356 is about 4542.5054760561. The cubic root of 20634356 is about 274.2817887066.

Adding to 20634356 its reverse (65343602), we get a palindrome (85977958).

The spelling of 20634356 in words is "twenty million, six hundred thirty-four thousand, three hundred fifty-six".