20842273 has 4 divisors (see below), whose sum is σ = 20855488. Its totient is φ = 20829060.

The previous prime is 20842247. The next prime is 20842277. The reversal of 20842273 is 37224802.

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 20842273 - 2⁹ = 20841761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20842277) 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 3 ways as a sum of consecutive naturals, for example, 3861 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (5213872).

Almost surely, 2^20842273 is an apocalyptic number.

It is an amenable number.

20842273 is a deficient number, since it is larger than the sum of its proper divisors (13215).

20842273 is a wasteful number, since it uses less digits than its factorization.

20842273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13214.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20842273 is about 4565.3338322624. Note that the first 3 decimals coincide. The cubic root of 20842273 is about 275.1999559517.

It can be divided in two parts, 20842 and 273, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20842273 in words is "twenty million, eight hundred forty-two thousand, two hundred seventy-three".