20404244177 has 2 divisors, whose sum is σ = 20404244178. Its totient is φ = 20404244176.

The previous prime is 20404244171. The next prime is 20404244243. The reversal of 20404244177 is 77144240402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15621000256 + 4783243921 = 124984^2 + 69161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404244177 - 2⁸ = 20404243921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404244171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202122088 + 10202122089.

It is an arithmetic number, because the mean of its divisors is an integer number (10202122089).

Almost surely, 2^20404244177 is an apocalyptic number.

It is an amenable number.

20404244177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404244177 is an equidigital number, since it uses as much as digits as its factorization.

20404244177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176, while the sum is 35.

Adding to 20404244177 its reverse (77144240402), we get a palindrome (97548484579).

The spelling of 20404244177 in words is "twenty billion, four hundred four million, two hundred forty-four thousand, one hundred seventy-seven".