20291487443 has 2 divisors, whose sum is σ = 20291487444. Its totient is φ = 20291487442.

The previous prime is 20291487367. The next prime is 20291487479. The reversal of 20291487443 is 34478419202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20291487443 - 2²² = 20287293139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20291487394 and 20291487403.

It is not a weakly prime, because it can be changed into another prime (20291447443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145743721 + 10145743722.

It is an arithmetic number, because the mean of its divisors is an integer number (10145743722).

Almost surely, 2^20291487443 is an apocalyptic number.

20291487443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20291487443 is an equidigital number, since it uses as much as digits as its factorization.

20291487443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 20291487443 in words is "twenty billion, two hundred ninety-one million, four hundred eighty-seven thousand, four hundred forty-three".