20807443 has 2 divisors, whose sum is σ = 20807444. Its totient is φ = 20807442.

The previous prime is 20807407. The next prime is 20807447. The reversal of 20807443 is 34470802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20807443 - 2¹⁷ = 20676371 is a prime.

It is equal to p_1318564 and since 20807443 and 1318564 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20807447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10403721 + 10403722.

It is an arithmetic number, because the mean of its divisors is an integer number (10403722).

Almost surely, 2^20807443 is an apocalyptic number.

20807443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20807443 is an equidigital number, since it uses as much as digits as its factorization.

20807443 is an evil number, because the sum of its binary digits is even.

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

The square root of 20807443 is about 4561.5176202663. The cubic root of 20807443 is about 275.0465728284.

The spelling of 20807443 in words is "twenty million, eight hundred seven thousand, four hundred forty-three".