20011631797 has 2 divisors, whose sum is σ = 20011631798. Its totient is φ = 20011631796.

The previous prime is 20011631791. The next prime is 20011631807. The reversal of 20011631797 is 79713611002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17098439121 + 2913192676 = 130761^2 + 53974^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011631797 - 2³ = 20011631789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011631791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005815898 + 10005815899.

It is an arithmetic number, because the mean of its divisors is an integer number (10005815899).

Almost surely, 2^20011631797 is an apocalyptic number.

It is an amenable number.

20011631797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011631797 is an equidigital number, since it uses as much as digits as its factorization.

20011631797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The spelling of 20011631797 in words is "twenty billion, eleven million, six hundred thirty-one thousand, seven hundred ninety-seven".