20630181 has 32 divisors (see below), whose sum is σ = 34030080. Its totient is φ = 10929600.

The previous prime is 20630167. The next prime is 20630189. The reversal of 20630181 is 18103602.

It is not a de Polignac number, because 20630181 - 2¹⁰ = 20629157 is a prime.

It is a super-2 number, since 2×20630181² = 851208736185522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6886 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (1063440).

Almost surely, 2^20630181 is an apocalyptic number.

It is an amenable number.

20630181 is a deficient number, since it is larger than the sum of its proper divisors (13399899).

20630181 is a wasteful number, since it uses less digits than its factorization.

20630181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20630181 is about 4542.0459046557. The cubic root of 20630181 is about 274.2632887559.

Adding to 20630181 its reverse (18103602), we get a palindrome (38733783).

The spelling of 20630181 in words is "twenty million, six hundred thirty thousand, one hundred eighty-one".