20821327 has 2 divisors, whose sum is σ = 20821328. Its totient is φ = 20821326.

The previous prime is 20821309. The next prime is 20821349. The reversal of 20821327 is 72312802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20821327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20821387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410663 + 10410664.

It is an arithmetic number, because the mean of its divisors is an integer number (10410664).

Almost surely, 2^20821327 is an apocalyptic number.

20821327 is a deficient number, since it is larger than the sum of its proper divisors (1).

20821327 is an equidigital number, since it uses as much as digits as its factorization.

20821327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20821327 is about 4563.0392284091. The cubic root of 20821327 is about 275.1077351981.

The spelling of 20821327 in words is "twenty million, eight hundred twenty-one thousand, three hundred twenty-seven".