20723374487 has 2 divisors, whose sum is σ = 20723374488. Its totient is φ = 20723374486.

The previous prime is 20723374447. The next prime is 20723374501. The reversal of 20723374487 is 78447332702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20723374487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20723374447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361687243 + 10361687244.

It is an arithmetic number, because the mean of its divisors is an integer number (10361687244).

Almost surely, 2^20723374487 is an apocalyptic number.

20723374487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723374487 is an equidigital number, since it uses as much as digits as its factorization.

20723374487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 47.

The spelling of 20723374487 in words is "twenty billion, seven hundred twenty-three million, three hundred seventy-four thousand, four hundred eighty-seven".