20587223 has 2 divisors, whose sum is σ = 20587224. Its totient is φ = 20587222.

The previous prime is 20587219. The next prime is 20587247. The reversal of 20587223 is 32278502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20587223 - 2² = 20587219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20587123) by changing a digit.

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 as a sum of consecutive naturals, namely, 10293611 + 10293612.

It is an arithmetic number, because the mean of its divisors is an integer number (10293612).

Almost surely, 2^20587223 is an apocalyptic number.

20587223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20587223 is an equidigital number, since it uses as much as digits as its factorization.

20587223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20587223 is about 4537.3145141152. The cubic root of 20587223 is about 274.0727913234.

The spelling of 20587223 in words is "twenty million, five hundred eighty-seven thousand, two hundred twenty-three".