20872411 has 4 divisors (see below), whose sum is σ = 23854192. Its totient is φ = 17890632.

The previous prime is 20872409. The next prime is 20872417. The reversal of 20872411 is 11427802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11427802 = 2 ⋅5713901.

It is a cyclic number.

It is not a de Polignac number, because 20872411 - 2¹ = 20872409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20872417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490880 + ... + 1490893.

It is an arithmetic number, because the mean of its divisors is an integer number (5963548).

Almost surely, 2^20872411 is an apocalyptic number.

20872411 is a deficient number, since it is larger than the sum of its proper divisors (2981781).

20872411 is an equidigital number, since it uses as much as digits as its factorization.

20872411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981780.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20872411 is about 4568.6333842846. The cubic root of 20872411 is about 275.3325387683.

The spelling of 20872411 in words is "twenty million, eight hundred seventy-two thousand, four hundred eleven".