20630911 has 12 divisors (see below), whose sum is σ = 25411968. Its totient is φ = 16642752.

The previous prime is 20630893. The next prime is 20630963. The reversal of 20630911 is 11903602.

It is not a de Polignac number, because 20630911 - 2⁵ = 20630879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11551 + ... + 13216.

It is an arithmetic number, because the mean of its divisors is an integer number (2117664).

Almost surely, 2^20630911 is an apocalyptic number.

20630911 is a deficient number, since it is larger than the sum of its proper divisors (4781057).

20630911 is a wasteful number, since it uses less digits than its factorization.

20630911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24798 (or 24791 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20630911 is about 4542.1262642071. The cubic root of 20630911 is about 274.2665236579.

The spelling of 20630911 in words is "twenty million, six hundred thirty thousand, nine hundred eleven".