20105263 has 8 divisors (see below), whose sum is σ = 20502080. Its totient is φ = 19712160.

The previous prime is 20105257. The next prime is 20105273. The reversal of 20105263 is 36250102.

It is a happy number.

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 20105263 - 2⁹ = 20104751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20105263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105273) 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, 11593 + ... + 13213.

It is an arithmetic number, because the mean of its divisors is an integer number (2562760).

Almost surely, 2^20105263 is an apocalyptic number.

20105263 is a deficient number, since it is larger than the sum of its proper divisors (396817).

20105263 is a wasteful number, since it uses less digits than its factorization.

20105263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20105263 is about 4483.8892716034. The cubic root of 20105263 is about 271.9171415365.

Adding to 20105263 its reverse (36250102), we get a palindrome (56355365).

The spelling of 20105263 in words is "twenty million, one hundred five thousand, two hundred sixty-three".