20630844 has 54 divisors (see below), whose sum is σ = 56486976. Its totient is φ = 6346080.

The previous prime is 20630783. The next prime is 20630851. The reversal of 20630844 is 44803602.

20630844 is a `hidden beast` number, since 20 + 630 + 8 + 4 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4389 + ... + 7779.

Almost surely, 2^20630844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20630844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28243488).

20630844 is an abundant number, since it is smaller than the sum of its proper divisors (35856132).

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

20630844 is a wasteful number, since it uses less digits than its factorization.

20630844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427 (or 3409 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20630844 is about 4542.1188888007. The cubic root of 20630844 is about 274.2662267591.

The spelling of 20630844 in words is "twenty million, six hundred thirty thousand, eight hundred forty-four".