20916877523 has 2 divisors, whose sum is σ = 20916877524. Its totient is φ = 20916877522.

The previous prime is 20916877519. The next prime is 20916877573. The reversal of 20916877523 is 32577861902.

It is an a-pointer prime, because the next prime (20916877573) can be obtained adding 20916877523 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20916877523 - 2² = 20916877519 is a prime.

It is not a weakly prime, because it can be changed into another prime (20916877573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10458438761 + 10458438762.

It is an arithmetic number, because the mean of its divisors is an integer number (10458438762).

Almost surely, 2^20916877523 is an apocalyptic number.

20916877523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20916877523 is an equidigital number, since it uses as much as digits as its factorization.

20916877523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 20916877523 in words is "twenty billion, nine hundred sixteen million, eight hundred seventy-seven thousand, five hundred twenty-three".