20205630 has 48 divisors (see below), whose sum is σ = 52756704. Its totient is φ = 5365440.

The previous prime is 20205623. The next prime is 20205697. The reversal of 20205630 is 3650202.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 41247 + ... + 41733.

It is an arithmetic number, because the mean of its divisors is an integer number (1099098).

Almost surely, 2^20205630 is an apocalyptic number.

20205630 is an abundant number, since it is smaller than the sum of its proper divisors (32551074).

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

20205630 is a wasteful number, since it uses less digits than its factorization.

20205630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20205630 is about 4495.0672964929. The cubic root of 20205630 is about 272.3688676926.

Adding to 20205630 its reverse (3650202), we get a palindrome (23855832).

The spelling of 20205630 in words is "twenty million, two hundred five thousand, six hundred thirty".