20882021 has 8 divisors (see below), whose sum is σ = 21121944. Its totient is φ = 20643840.

The previous prime is 20882009. The next prime is 20882033. The reversal of 20882021 is 12028802.

It is an interprime number because it is at equal distance from previous prime (20882009) and next prime (20882033).

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 19802500 = 1039^2 + 4450^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20882021 - 2²² = 16687717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20882921) 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, 49391 + ... + 49811.

It is an arithmetic number, because the mean of its divisors is an integer number (2640243).

Almost surely, 2^20882021 is an apocalyptic number.

It is an amenable number.

20882021 is a deficient number, since it is larger than the sum of its proper divisors (239923).

20882021 is a wasteful number, since it uses less digits than its factorization.

20882021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20882021 is about 4569.6850000848. The cubic root of 20882021 is about 275.3747881555.

The spelling of 20882021 in words is "twenty million, eight hundred eighty-two thousand, twenty-one".