20309902734923 has 2 divisors, whose sum is σ = 20309902734924. Its totient is φ = 20309902734922.

The previous prime is 20309902734871. The next prime is 20309902734937. The reversal of 20309902734923 is 32943720990302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20309902734923 - 2¹² = 20309902730827 is a prime.

It is not a weakly prime, because it can be changed into another prime (20309902734623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10154951367461 + 10154951367462.

It is an arithmetic number, because the mean of its divisors is an integer number (10154951367462).

Almost surely, 2^{20309902734923} is an apocalyptic number.

20309902734923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20309902734923 is an equidigital number, since it uses as much as digits as its factorization.

20309902734923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4408992, while the sum is 53.

The spelling of 20309902734923 in words is "twenty trillion, three hundred nine billion, nine hundred two million, seven hundred thirty-four thousand, nine hundred twenty-three".