20847433 has 8 divisors (see below), whose sum is σ = 21674880. Its totient is φ = 20027280.

The previous prime is 20847419. The next prime is 20847443. The reversal of 20847433 is 33474802.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20847433 - 2⁵ = 20847401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20847395 and 20847404.

It is not an unprimeable number, because it can be changed into a prime (20847403) 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 7 ways as a sum of consecutive naturals, for example, 4416 + ... + 7822.

It is an arithmetic number, because the mean of its divisors is an integer number (2709360).

Almost surely, 2^20847433 is an apocalyptic number.

It is an amenable number.

20847433 is a deficient number, since it is larger than the sum of its proper divisors (827447).

20847433 is a wasteful number, since it uses less digits than its factorization.

20847433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20847433 is about 4565.8989257319. The cubic root of 20847433 is about 275.2226648408. Note that the first 3 decimals are identical.

The spelling of 20847433 in words is "twenty million, eight hundred forty-seven thousand, four hundred thirty-three".