20874013 has 2 divisors, whose sum is σ = 20874014. Its totient is φ = 20874012.

The previous prime is 20874001. The next prime is 20874059. The reversal of 20874013 is 31047802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17623204 + 3250809 = 4198^2 + 1803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20874013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20874313) 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, 10437006 + 10437007.

It is an arithmetic number, because the mean of its divisors is an integer number (10437007).

Almost surely, 2^20874013 is an apocalyptic number.

It is an amenable number.

20874013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874013 is an equidigital number, since it uses as much as digits as its factorization.

20874013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20874013 is about 4568.8087068732. The cubic root of 20874013 is about 275.3395826989.

The spelling of 20874013 in words is "twenty million, eight hundred seventy-four thousand, thirteen".