20863169 has 2 divisors, whose sum is σ = 20863170. Its totient is φ = 20863168.

The previous prime is 20863147. The next prime is 20863177. The reversal of 20863169 is 96136802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 9840769 = 3320^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 20863169 - 2⁸ = 20862913 is a prime.

It is a super-2 number, since 2×20863169² = 870543641445122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20862169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431584 + 10431585.

It is an arithmetic number, because the mean of its divisors is an integer number (10431585).

Almost surely, 2^20863169 is an apocalyptic number.

It is an amenable number.

20863169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20863169 is an equidigital number, since it uses as much as digits as its factorization.

20863169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20863169 is about 4567.6218100889. The cubic root of 20863169 is about 275.2918950210.

The spelling of 20863169 in words is "twenty million, eight hundred sixty-three thousand, one hundred sixty-nine".