20448797477 has 2 divisors, whose sum is σ = 20448797478. Its totient is φ = 20448797476.

The previous prime is 20448797371. The next prime is 20448797483. The reversal of 20448797477 is 77479784402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20131636996 + 317160481 = 141886^2 + 17809^2 .

It is a cyclic number.

It is not a de Polignac number, because 20448797477 - 2¹⁸ = 20448535333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20448797977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224398738 + 10224398739.

It is an arithmetic number, because the mean of its divisors is an integer number (10224398739).

Almost surely, 2^20448797477 is an apocalyptic number.

It is an amenable number.

20448797477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20448797477 is an equidigital number, since it uses as much as digits as its factorization.

20448797477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22127616, while the sum is 59.

The spelling of 20448797477 in words is "twenty billion, four hundred forty-eight million, seven hundred ninety-seven thousand, four hundred seventy-seven".