20771873 has 4 divisors (see below), whose sum is σ = 20814000. Its totient is φ = 20729748.

The previous prime is 20771867. The next prime is 20771887. The reversal of 20771873 is 37817702.

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.

It is a cyclic number.

It is not a de Polignac number, because 20771873 - 2¹² = 20767777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20771843) 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, 20315 + ... + 21312.

It is an arithmetic number, because the mean of its divisors is an integer number (5203500).

Almost surely, 2^20771873 is an apocalyptic number.

It is an amenable number.

20771873 is a deficient number, since it is larger than the sum of its proper divisors (42127).

20771873 is an equidigital number, since it uses as much as digits as its factorization.

20771873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42126.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 20771873 is about 4557.6170308616. The cubic root of 20771873 is about 274.8897541561.

The spelling of 20771873 in words is "twenty million, seven hundred seventy-one thousand, eight hundred seventy-three".