20342665 has 16 divisors (see below), whose sum is σ = 28800000. Its totient is φ = 13498560.

The previous prime is 20342633. The next prime is 20342687. The reversal of 20342665 is 56624302.

It is a happy number.

It is not a de Polignac number, because 20342665 - 2⁵ = 20342633 is a prime.

It is a plaindrome in base 16.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 8290 + ... + 10459.

It is an arithmetic number, because the mean of its divisors is an integer number (1800000).

Almost surely, 2^20342665 is an apocalyptic number.

It is an amenable number.

20342665 is a deficient number, since it is larger than the sum of its proper divisors (8457335).

20342665 is a wasteful number, since it uses less digits than its factorization.

20342665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18792.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20342665 is about 4510.2843591064. The cubic root of 20342665 is about 272.9832180285.

Adding to 20342665 its reverse (56624302), we get a palindrome (76966967).

The spelling of 20342665 in words is "twenty million, three hundred forty-two thousand, six hundred sixty-five".