20321666210 has 32 divisors (see below), whose sum is σ = 39013455600. Its totient is φ = 7594657792.

The previous prime is 20321666207. The next prime is 20321666231. The reversal of 20321666210 is 1266612302.

It can be written as a sum of positive squares in 8 ways, for example, as 6317547289 + 14004118921 = 79483^2 + 118339^2 .

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 15 ways as a sum of consecutive naturals, for example, 412985 + ... + 459564.

Almost surely, 2^20321666210 is an apocalyptic number.

20321666210 is a deficient number, since it is larger than the sum of its proper divisors (18691789390).

20321666210 is a wasteful number, since it uses less digits than its factorization.

20321666210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872710.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20321666210 in words is "twenty billion, three hundred twenty-one million, six hundred sixty-six thousand, two hundred ten".