20775021 has 8 divisors (see below), whose sum is σ = 28169760. Its totient is φ = 13615152.

The previous prime is 20775011. The next prime is 20775031. The reversal of 20775021 is 12057702.

It is an interprime number because it is at equal distance from previous prime (20775011) and next prime (20775031).

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

It is not a de Polignac number, because 20775021 - 2¹⁰ = 20773997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20774982 and 20775000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58510 + ... + 58863.

It is an arithmetic number, because the mean of its divisors is an integer number (3521220).

Almost surely, 2^20775021 is an apocalyptic number.

It is an amenable number.

20775021 is a deficient number, since it is larger than the sum of its proper divisors (7394739).

20775021 is a wasteful number, since it uses less digits than its factorization.

20775021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117435.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20775021 is about 4557.9623736929. The cubic root of 20775021 is about 274.9036400686.

The spelling of 20775021 in words is "twenty million, seven hundred seventy-five thousand, twenty-one".