20012319491 has 2 divisors, whose sum is σ = 20012319492. Its totient is φ = 20012319490.

The previous prime is 20012319479. The next prime is 20012319541. The reversal of 20012319491 is 19491321002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012319491 - 2¹⁴ = 20012303107 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012319401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006159745 + 10006159746.

It is an arithmetic number, because the mean of its divisors is an integer number (10006159746).

Almost surely, 2^20012319491 is an apocalyptic number.

20012319491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012319491 is an equidigital number, since it uses as much as digits as its factorization.

20012319491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 20012319491 in words is "twenty billion, twelve million, three hundred nineteen thousand, four hundred ninety-one".