20345669 has 2 divisors, whose sum is σ = 20345670. Its totient is φ = 20345668.

The previous prime is 20345659. The next prime is 20345681. The reversal of 20345669 is 96654302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 543169 = 4450^2 + 737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20345669 is a prime.

It is a super-2 number, since 2×20345669² = 827892494115122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172834 + 10172835.

It is an arithmetic number, because the mean of its divisors is an integer number (10172835).

Almost surely, 2^20345669 is an apocalyptic number.

It is an amenable number.

20345669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345669 is an equidigital number, since it uses as much as digits as its factorization.

20345669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 20345669 is about 4510.6173635102. The cubic root of 20345669 is about 272.9966545051.

The spelling of 20345669 in words is "twenty million, three hundred forty-five thousand, six hundred sixty-nine".