20874017 has 4 divisors (see below), whose sum is σ = 21216276. Its totient is φ = 20531760.

The previous prime is 20874013. The next prime is 20874059. The reversal of 20874017 is 71047802.

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 3225616 + 17648401 = 1796^2 + 4201^2 .

It is a cyclic number.

It is not a de Polignac number, because 20874017 - 2² = 20874013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20874013) 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 in 3 ways as a sum of consecutive naturals, for example, 171038 + ... + 171159.

It is an arithmetic number, because the mean of its divisors is an integer number (5304069).

Almost surely, 2^20874017 is an apocalyptic number.

It is an amenable number.

20874017 is a deficient number, since it is larger than the sum of its proper divisors (342259).

20874017 is an equidigital number, since it uses as much as digits as its factorization.

20874017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342258.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20874017 is about 4568.8091446240. The cubic root of 20874017 is about 275.3396002862.

The spelling of 20874017 in words is "twenty million, eight hundred seventy-four thousand, seventeen".