20831661469 has 2 divisors, whose sum is σ = 20831661470. Its totient is φ = 20831661468.

The previous prime is 20831661391. The next prime is 20831661497. The reversal of 20831661469 is 96416613802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11971204569 + 8860456900 = 109413^2 + 94130^2 .

It is a cyclic number.

It is not a de Polignac number, because 20831661469 - 2¹⁹ = 20831137181 is a prime.

It is a super-2 number, since 2×20831661469² (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 (20831668469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415830734 + 10415830735.

It is an arithmetic number, because the mean of its divisors is an integer number (10415830735).

Almost surely, 2^20831661469 is an apocalyptic number.

It is an amenable number.

20831661469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20831661469 is an equidigital number, since it uses as much as digits as its factorization.

20831661469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 20831661469 in words is "twenty billion, eight hundred thirty-one million, six hundred sixty-one thousand, four hundred sixty-nine".