20831219435777 has 4 divisors (see below), whose sum is σ = 21082197983280. Its totient is φ = 20580240888276.

The previous prime is 20831219435759. The next prime is 20831219435801. The reversal of 20831219435777 is 77753491213802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20831219435777 - 2²⁰ = 20831218387201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20831219431777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125489273627 + ... + 125489273792.

It is an arithmetic number, because the mean of its divisors is an integer number (5270549495820).

Almost surely, 2^{20831219435777} is an apocalyptic number.

It is an amenable number.

20831219435777 is a deficient number, since it is larger than the sum of its proper divisors (250978547503).

20831219435777 is an equidigital number, since it uses as much as digits as its factorization.

20831219435777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250978547502.

The product of its (nonzero) digits is 17781120, while the sum is 59.

The spelling of 20831219435777 in words is "twenty trillion, eight hundred thirty-one billion, two hundred nineteen million, four hundred thirty-five thousand, seven hundred seventy-seven".