20836930 has 8 divisors (see below), whose sum is σ = 37506492. Its totient is φ = 8334768.

The previous prime is 20836927. The next prime is 20836931. The reversal of 20836930 is 3963802.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19070689 + 1766241 = 4367^2 + 1329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20836892 and 20836901.

It is not an unprimeable number, because it can be changed into a prime (20836931) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1041837 + ... + 1041856.

Almost surely, 2^20836930 is an apocalyptic number.

20836930 is a deficient number, since it is larger than the sum of its proper divisors (16669562).

20836930 is a wasteful number, since it uses less digits than its factorization.

20836930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083700.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20836930 is about 4564.7486239661. The cubic root of 20836930 is about 275.1764377390.

The spelling of 20836930 in words is "twenty million, eight hundred thirty-six thousand, nine hundred thirty".