20966530 has 16 divisors (see below), whose sum is σ = 40643064. Its totient is φ = 7741440.

The previous prime is 20966479. The next prime is 20966537. The reversal of 20966530 is 3566902.

It can be written as a sum of positive squares in 4 ways, for example, as 11621281 + 9345249 = 3409^2 + 3057^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20966492 and 20966501.

It is not an unprimeable number, because it can be changed into a prime (20966537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80511 + ... + 80770.

Almost surely, 2^20966530 is an apocalyptic number.

20966530 is a deficient number, since it is larger than the sum of its proper divisors (19676534).

20966530 is a wasteful number, since it uses less digits than its factorization.

20966530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161301.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 20966530 is about 4578.9223623032. The cubic root of 20966530 is about 275.7457663782.

The spelling of 20966530 in words is "twenty million, nine hundred sixty-six thousand, five hundred thirty".