20630930 has 16 divisors (see below), whose sum is σ = 37520280. Its totient is φ = 8166912.

The previous prime is 20630893. The next prime is 20630963. The reversal of 20630930 is 3903602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16785409 + 3845521 = 4097^2 + 1961^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20630896 and 20630905.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9665 + ... + 11604.

Almost surely, 2^20630930 is an apocalyptic number.

20630930 is a deficient number, since it is larger than the sum of its proper divisors (16889350).

20630930 is a wasteful number, since it uses less digits than its factorization.

20630930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21373.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 20630930 is about 4542.1283557381. The cubic root of 20630930 is about 274.2666078529.

The spelling of 20630930 in words is "twenty million, six hundred thirty thousand, nine hundred thirty".