20606263 has 4 divisors (see below), whose sum is σ = 20623608. Its totient is φ = 20588920.

The previous prime is 20606237. The next prime is 20606273. The reversal of 20606263 is 36260602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20606263 is a prime.

It is a super-3 number, since 3×20606263³ (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 (20606273) 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, 6748 + ... + 9313.

It is an arithmetic number, because the mean of its divisors is an integer number (5155902).

Almost surely, 2^20606263 is an apocalyptic number.

20606263 is a deficient number, since it is larger than the sum of its proper divisors (17345).

20606263 is a wasteful number, since it uses less digits than its factorization.

20606263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17344.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20606263 is about 4539.4121866162. The cubic root of 20606263 is about 274.1572569497.

Adding to 20606263 its reverse (36260602), we get a palindrome (56866865).

The spelling of 20606263 in words is "twenty million, six hundred six thousand, two hundred sixty-three".