20709630 has 24 divisors (see below), whose sum is σ = 53845272. Its totient is φ = 5522544.

The previous prime is 20709629. The next prime is 20709641. The reversal of 20709630 is 3690702.

20709630 is a `hidden beast` number, since 20 + 7 + 0 + 9 + 630 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20709594 and 20709603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114964 + ... + 115143.

It is an arithmetic number, because the mean of its divisors is an integer number (2243553).

Almost surely, 2^20709630 is an apocalyptic number.

20709630 is an abundant number, since it is smaller than the sum of its proper divisors (33135642).

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

20709630 is a wasteful number, since it uses less digits than its factorization.

20709630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230120 (or 230117 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20709630 is about 4550.7834490338. The cubic root of 20709630 is about 274.6149100356.

The spelling of 20709630 in words is "twenty million, seven hundred nine thousand, six hundred thirty".