20831261719 has 2 divisors, whose sum is σ = 20831261720. Its totient is φ = 20831261718.

The previous prime is 20831261663. The next prime is 20831261761. The reversal of 20831261719 is 91716213802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20831261719 - 2²¹ = 20829164567 is a prime.

It is a super-2 number, since 2×20831261719² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20831261419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415630859 + 10415630860.

It is an arithmetic number, because the mean of its divisors is an integer number (10415630860).

Almost surely, 2^20831261719 is an apocalyptic number.

20831261719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20831261719 is an equidigital number, since it uses as much as digits as its factorization.

20831261719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 20831261719 in words is "twenty billion, eight hundred thirty-one million, two hundred sixty-one thousand, seven hundred nineteen".