20279321 has 2 divisors, whose sum is σ = 20279322. Its totient is φ = 20279320.

The previous prime is 20279309. The next prime is 20279339. The reversal of 20279321 is 12397202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 7398400 = 3589^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20279321 - 2⁶ = 20279257 is a prime.

It is a super-2 number, since 2×20279321² = 822501720442082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20273321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139660 + 10139661.

It is an arithmetic number, because the mean of its divisors is an integer number (10139661).

Almost surely, 2^20279321 is an apocalyptic number.

It is an amenable number.

20279321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20279321 is an equidigital number, since it uses as much as digits as its factorization.

20279321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20279321 is about 4503.2567104264. The cubic root of 20279321 is about 272.6995805250.

The spelling of 20279321 in words is "twenty million, two hundred seventy-nine thousand, three hundred twenty-one".