20477895397 has 2 divisors, whose sum is σ = 20477895398. Its totient is φ = 20477895396.

The previous prime is 20477895359. The next prime is 20477895419. The reversal of 20477895397 is 79359877402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20319362116 + 158533281 = 142546^2 + 12591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20477895397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20477895307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10238947698 + 10238947699.

It is an arithmetic number, because the mean of its divisors is an integer number (10238947699).

Almost surely, 2^20477895397 is an apocalyptic number.

It is an amenable number.

20477895397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20477895397 is an equidigital number, since it uses as much as digits as its factorization.

20477895397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 20477895397 in words is "twenty billion, four hundred seventy-seven million, eight hundred ninety-five thousand, three hundred ninety-seven".