20500404773 has 2 divisors, whose sum is σ = 20500404774. Its totient is φ = 20500404772.

The previous prime is 20500404707. The next prime is 20500404809. The reversal of 20500404773 is 37740400502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13647379684 + 6853025089 = 116822^2 + 82783^2 .

It is a cyclic number.

It is not a de Polignac number, because 20500404773 - 2³⁰ = 19426662949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500404073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250202386 + 10250202387.

It is an arithmetic number, because the mean of its divisors is an integer number (10250202387).

Almost surely, 2^20500404773 is an apocalyptic number.

It is an amenable number.

20500404773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500404773 is an equidigital number, since it uses as much as digits as its factorization.

20500404773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 32.

The spelling of 20500404773 in words is "twenty billion, five hundred million, four hundred four thousand, seven hundred seventy-three".