20291443 has 2 divisors, whose sum is σ = 20291444. Its totient is φ = 20291442.

The previous prime is 20291437. The next prime is 20291471. The reversal of 20291443 is 34419202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20291443 - 2⁹ = 20290931 is a prime.

It is not a weakly prime, because it can be changed into another prime (20291423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145721 + 10145722.

It is an arithmetic number, because the mean of its divisors is an integer number (10145722).

Almost surely, 2^20291443 is an apocalyptic number.

20291443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20291443 is an equidigital number, since it uses as much as digits as its factorization.

20291443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20291443 is about 4504.6024241880. The cubic root of 20291443 is about 272.7539052544.

The spelling of 20291443 in words is "twenty million, two hundred ninety-one thousand, four hundred forty-three".