20514817 has 4 divisors (see below), whose sum is σ = 20718036. Its totient is φ = 20311600.

The previous prime is 20514787. The next prime is 20514829. The reversal of 20514817 is 71841502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16192576 + 4322241 = 4024^2 + 2079^2 .

It is a cyclic number.

It is not a de Polignac number, because 20514817 - 2¹¹ = 20512769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20514877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101458 + ... + 101659.

It is an arithmetic number, because the mean of its divisors is an integer number (5179509).

Almost surely, 2^20514817 is an apocalyptic number.

It is an amenable number.

20514817 is a deficient number, since it is larger than the sum of its proper divisors (203219).

20514817 is a wasteful number, since it uses less digits than its factorization.

20514817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203218.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 20514817 is about 4529.3285374325. The cubic root of 20514817 is about 273.7511059636.

The spelling of 20514817 in words is "twenty million, five hundred fourteen thousand, eight hundred seventeen".