20111630 has 32 divisors (see below), whose sum is σ = 45135360. Its totient is φ = 6268320.

The previous prime is 20111621. The next prime is 20111681. The reversal of 20111630 is 3611102.

It is a super-2 number, since 2×20111630² = 808955322513800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12290 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (1410480).

Almost surely, 2^20111630 is an apocalyptic number.

20111630 is an abundant number, since it is smaller than the sum of its proper divisors (25023730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111630 is a wasteful number, since it uses less digits than its factorization.

20111630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26144.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 20111630 is about 4484.5992017125. The cubic root of 20111630 is about 271.9458423749.

Adding to 20111630 its reverse (3611102), we get a palindrome (23722732).

The spelling of 20111630 in words is "twenty million, one hundred eleven thousand, six hundred thirty".