20812847 has 16 divisors (see below), whose sum is σ = 24126720. Its totient is φ = 17903160.

The previous prime is 20812843. The next prime is 20812849. The reversal of 20812847 is 74821802.

It is not a de Polignac number, because 20812847 - 2² = 20812843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24878 + ... + 25700.

It is an arithmetic number, because the mean of its divisors is an integer number (1507920).

Almost surely, 2^20812847 is an apocalyptic number.

20812847 is a deficient number, since it is larger than the sum of its proper divisors (3313873).

20812847 is an equidigital number, since it uses as much as digits as its factorization.

20812847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 20812847 is about 4562.1099285309. The cubic root of 20812847 is about 275.0703819853.

The spelling of 20812847 in words is "twenty million, eight hundred twelve thousand, eight hundred forty-seven".