20631026695321 has 27 divisors (see below), whose sum is σ = 24225624636381. Its totient is φ = 17518557740544.

The previous prime is 20631026695303. The next prime is 20631026695327. The reversal of 20631026695321 is 12359662013602.

The square root of 20631026695321 is 4542139.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4590713334025 + 16040313361296 = 2142595^2 + 4005036^2 .

It is not a de Polignac number, because 20631026695321 - 2⁵ = 20631026695289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20631026695327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3465649081 + ... + 3465655033.

It is an arithmetic number, because the mean of its divisors is an integer number (897245356903).

Almost surely, 2^{20631026695321} is an apocalyptic number.

20631026695321 is the 4542139-th square number.

20631026695321 is the 2271070-th centered octagonal number.

It is an amenable number.

20631026695321 is a deficient number, since it is larger than the sum of its proper divisors (3594597941060).

20631026695321 is an frugal number, since it uses more digits than its factorization.

20631026695321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12138 (or 6069 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 20631026695321 in words is "twenty trillion, six hundred thirty-one billion, twenty-six million, six hundred ninety-five thousand, three hundred twenty-one".