20936567 has 2 divisors, whose sum is σ = 20936568. Its totient is φ = 20936566.

The previous prime is 20936549. The next prime is 20936581. The reversal of 20936567 is 76563902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20936567 - 2¹⁶ = 20871031 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20936567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20936507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468283 + 10468284.

It is an arithmetic number, because the mean of its divisors is an integer number (10468284).

Almost surely, 2^20936567 is an apocalyptic number.

20936567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20936567 is an equidigital number, since it uses as much as digits as its factorization.

20936567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 20936567 is about 4575.6493528241. The cubic root of 20936567 is about 275.6143488393.

It can be divided in two parts, 2093 and 6567, that multiplied together give a palindrome (13744731).

The spelling of 20936567 in words is "twenty million, nine hundred thirty-six thousand, five hundred sixty-seven".