20631004131989 has 2 divisors, whose sum is σ = 20631004131990. Its totient is φ = 20631004131988.

The previous prime is 20631004131937. The next prime is 20631004132031. The reversal of 20631004131989 is 98913140013602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19909934823025 + 721069308964 = 4462055^2 + 849158^2 .

It is a cyclic number.

It is not a de Polignac number, because 20631004131989 - 2¹² = 20631004127893 is a prime.

It is a super-2 number, since 2×20631004131989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20631004131919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315502065994 + 10315502065995.

It is an arithmetic number, because the mean of its divisors is an integer number (10315502065995).

Almost surely, 2^{20631004131989} is an apocalyptic number.

It is an amenable number.

20631004131989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20631004131989 is an equidigital number, since it uses as much as digits as its factorization.

20631004131989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 20631004131989 in words is "twenty trillion, six hundred thirty-one billion, four million, one hundred thirty-one thousand, nine hundred eighty-nine".