20870833 has 4 divisors (see below), whose sum is σ = 20900980. Its totient is φ = 20840688.

The previous prime is 20870813. The next prime is 20870869. The reversal of 20870833 is 33807802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12616704 + 8254129 = 3552^2 + 2873^2 .

It is a cyclic number.

It is not a de Polignac number, because 20870833 - 2⁹ = 20870321 is a prime.

It is a super-2 number, since 2×20870833² = 871183340227778, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20870795 and 20870804.

It is not an unprimeable number, because it can be changed into a prime (20870813) 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, 14010 + ... + 15427.

It is an arithmetic number, because the mean of its divisors is an integer number (5225245).

Almost surely, 2^20870833 is an apocalyptic number.

It is an amenable number.

20870833 is a deficient number, since it is larger than the sum of its proper divisors (30147).

20870833 is an equidigital number, since it uses as much as digits as its factorization.

20870833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30146.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20870833 is about 4568.4606816739. The cubic root of 20870833 is about 275.3256000124.

The spelling of 20870833 in words is "twenty million, eight hundred seventy thousand, eight hundred thirty-three".