20715169 has 2 divisors, whose sum is σ = 20715170. Its totient is φ = 20715168.

The previous prime is 20715113. The next prime is 20715199. The reversal of 20715169 is 96151702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 8381025 = 3512^2 + 2895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20715169 - 2⁷ = 20715041 is a prime.

It is a super-2 number, since 2×20715169² = 858236453397122, which contains 22 as substring.

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 20715169.

It is not a weakly prime, because it can be changed into another prime (20715199) 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, 10357584 + 10357585.

It is an arithmetic number, because the mean of its divisors is an integer number (10357585).

Almost surely, 2^20715169 is an apocalyptic number.

It is an amenable number.

20715169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20715169 is an equidigital number, since it uses as much as digits as its factorization.

20715169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 20715169 is about 4551.3919848767. The cubic root of 20715169 is about 274.6393906982.

It can be divided in two parts, 207 and 15169, that added together give a square (15376 = 124²).

The spelling of 20715169 in words is "twenty million, seven hundred fifteen thousand, one hundred sixty-nine".