20613169 has 2 divisors, whose sum is σ = 20613170. Its totient is φ = 20613168.

The previous prime is 20613167. The next prime is 20613193. The reversal of 20613169 is 96131602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20358144 + 255025 = 4512^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 20613169 - 2¹ = 20613167 is a prime.

It is a super-2 number, since 2×20613169² = 849805472445122, which contains 22 as substring.

Together with 20613167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20613167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306584 + 10306585.

It is an arithmetic number, because the mean of its divisors is an integer number (10306585).

Almost surely, 2^20613169 is an apocalyptic number.

It is an amenable number.

20613169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613169 is an equidigital number, since it uses as much as digits as its factorization.

20613169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20613169 is about 4540.1727940685. The cubic root of 20613169 is about 274.1878806253.

The spelling of 20613169 in words is "twenty million, six hundred thirteen thousand, one hundred sixty-nine".