20824873 has 4 divisors (see below), whose sum is σ = 21135760. Its totient is φ = 20513988.

The previous prime is 20824861. The next prime is 20824877. The reversal of 20824873 is 37842802.

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 a de Polignac number, because none of the positive numbers 2^k-20824873 is a prime.

It is a super-2 number, since 2×20824873² = 867350670932258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20824877) 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 3 ways as a sum of consecutive naturals, for example, 155343 + ... + 155476.

It is an arithmetic number, because the mean of its divisors is an integer number (5283940).

Almost surely, 2^20824873 is an apocalyptic number.

It is an amenable number.

20824873 is a deficient number, since it is larger than the sum of its proper divisors (310887).

20824873 is an equidigital number, since it uses as much as digits as its factorization.

20824873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310886.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 20824873 is about 4563.4277686844. The cubic root of 20824873 is about 275.1233518245.

The spelling of 20824873 in words is "twenty million, eight hundred twenty-four thousand, eight hundred seventy-three".