20831853551 has 2 divisors, whose sum is σ = 20831853552. Its totient is φ = 20831853550.

The previous prime is 20831853541. The next prime is 20831853583. The reversal of 20831853551 is 15535813802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20831853551 - 2³⁰ = 19758111727 is a prime.

It is a super-2 number, since 2×20831853551² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20831853499 and 20831853508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20831853541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415926775 + 10415926776.

It is an arithmetic number, because the mean of its divisors is an integer number (10415926776).

Almost surely, 2^20831853551 is an apocalyptic number.

20831853551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20831853551 is an equidigital number, since it uses as much as digits as its factorization.

20831853551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 20831853551 in words is "twenty billion, eight hundred thirty-one million, eight hundred fifty-three thousand, five hundred fifty-one".