20887241 has 4 divisors (see below), whose sum is σ = 20896512. Its totient is φ = 20877972.

The previous prime is 20887231. The next prime is 20887249. The reversal of 20887241 is 14278802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14278802 = 2 ⋅7139401.

It is a cyclic number.

It is not a de Polignac number, because 20887241 - 2⁶ = 20887177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20887198 and 20887207.

It is not an unprimeable number, because it can be changed into a prime (20887249) 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, 1160 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (5224128).

Almost surely, 2^20887241 is an apocalyptic number.

It is an amenable number.

20887241 is a deficient number, since it is larger than the sum of its proper divisors (9271).

20887241 is an equidigital number, since it uses as much as digits as its factorization.

20887241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9270.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 20887241 is about 4570.2561197377. The cubic root of 20887241 is about 275.3977319219.

The spelling of 20887241 in words is "twenty million, eight hundred eighty-seven thousand, two hundred forty-one".