20673563 has 2 divisors, whose sum is σ = 20673564. Its totient is φ = 20673562.

The previous prime is 20673533. The next prime is 20673593. The reversal of 20673563 is 36537602.

It is a balanced prime because it is at equal distance from previous prime (20673533) and next prime (20673593).

It is a cyclic number.

It is not a de Polignac number, because 20673563 - 2¹⁰ = 20672539 is a prime.

It is a super-2 number, since 2×20673563² = 854792414229938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20673533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336781 + 10336782.

It is an arithmetic number, because the mean of its divisors is an integer number (10336782).

Almost surely, 2^20673563 is an apocalyptic number.

20673563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673563 is an equidigital number, since it uses as much as digits as its factorization.

20673563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20673563 is about 4546.8189979369. The cubic root of 20673563 is about 274.4553982320.

The spelling of 20673563 in words is "twenty million, six hundred seventy-three thousand, five hundred sixty-three".