20211087 has 8 divisors (see below), whose sum is σ = 29021104. Its totient is φ = 12437568.

The previous prime is 20211077. The next prime is 20211097. The reversal of 20211087 is 78011202.

It is an interprime number because it is at equal distance from previous prime (20211077) and next prime (20211097).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20211087 - 2⁷ = 20210959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211007) 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 in 7 ways as a sum of consecutive naturals, for example, 259078 + ... + 259155.

It is an arithmetic number, because the mean of its divisors is an integer number (3627638).

Almost surely, 2^20211087 is an apocalyptic number.

20211087 is a deficient number, since it is larger than the sum of its proper divisors (8810017).

20211087 is a wasteful number, since it uses less digits than its factorization.

20211087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518249.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20211087 is about 4495.6742542137. The cubic root of 20211087 is about 272.3933853332.

Adding to 20211087 its reverse (78011202), we get a palindrome (98222289).

The spelling of 20211087 in words is "twenty million, two hundred eleven thousand, eighty-seven".