20636630 has 16 divisors (see below), whose sum is σ = 42452640. Its totient is φ = 7075392.

The previous prime is 20636621. The next prime is 20636683. The reversal of 20636630 is 3663602.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20636630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147335 + ... + 147474.

It is an arithmetic number, because the mean of its divisors is an integer number (2653290).

Almost surely, 2^20636630 is an apocalyptic number.

20636630 is an abundant number, since it is smaller than the sum of its proper divisors (21816010).

20636630 is a wasteful number, since it uses less digits than its factorization.

20636630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294823.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 20636630 is about 4542.7557715554. The cubic root of 20636630 is about 274.2918640373.

The spelling of 20636630 in words is "twenty million, six hundred thirty-six thousand, six hundred thirty".