20963210 has 32 divisors (see below), whose sum is σ = 40182480. Its totient is φ = 7846912.

The previous prime is 20963197. The next prime is 20963219. The reversal of 20963210 is 1236902.

It can be written as a sum of positive squares in 8 ways, for example, as 3964081 + 16999129 = 1991^2 + 4123^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20963219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53696 + ... + 54084.

Almost surely, 2^20963210 is an apocalyptic number.

20963210 is a deficient number, since it is larger than the sum of its proper divisors (19219270).

20963210 is a wasteful number, since it uses less digits than its factorization.

20963210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20963210 is about 4578.5598172351. The cubic root of 20963210 is about 275.7312110485.

The spelling of 20963210 in words is "twenty million, nine hundred sixty-three thousand, two hundred ten".