20034473643491 has 2 divisors, whose sum is σ = 20034473643492. Its totient is φ = 20034473643490.

The previous prime is 20034473643397. The next prime is 20034473643517. The reversal of 20034473643491 is 19434637443002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20034473643491 - 2¹⁸ = 20034473381347 is a prime.

It is not a weakly prime, because it can be changed into another prime (20034473643991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10017236821745 + 10017236821746.

It is an arithmetic number, because the mean of its divisors is an integer number (10017236821746).

Almost surely, 2^{20034473643491} is an apocalyptic number.

20034473643491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20034473643491 is an equidigital number, since it uses as much as digits as its factorization.

20034473643491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 50.

The spelling of 20034473643491 in words is "twenty trillion, thirty-four billion, four hundred seventy-three million, six hundred forty-three thousand, four hundred ninety-one".