20872837 has 4 divisors (see below), whose sum is σ = 21592620. Its totient is φ = 20153056.

The previous prime is 20872807. The next prime is 20872853. The reversal of 20872837 is 73827802.

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 5262436 + 15610401 = 2294^2 + 3951^2 .

It is a cyclic number.

It is not a de Polignac number, because 20872837 - 2²³ = 12484229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20872796 and 20872805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20872807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359848 + ... + 359905.

It is an arithmetic number, because the mean of its divisors is an integer number (5398155).

Almost surely, 2^20872837 is an apocalyptic number.

It is an amenable number.

20872837 is a deficient number, since it is larger than the sum of its proper divisors (719783).

20872837 is an equidigital number, since it uses as much as digits as its factorization.

20872837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719782.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 20872837 is about 4568.6800063038. The cubic root of 20872837 is about 275.3344119086.

The spelling of 20872837 in words is "twenty million, eight hundred seventy-two thousand, eight hundred thirty-seven".