20009973738473 has 2 divisors, whose sum is σ = 20009973738474. Its totient is φ = 20009973738472.

The previous prime is 20009973738467. The next prime is 20009973738493. The reversal of 20009973738473 is 37483737990002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15415925921344 + 4594047817129 = 3926312^2 + 2143373^2 .

It is a cyclic number.

It is not a de Polignac number, because 20009973738473 - 2¹⁰ = 20009973737449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20009973738463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004986869236 + 10004986869237.

It is an arithmetic number, because the mean of its divisors is an integer number (10004986869237).

Almost surely, 2^{20009973738473} is an apocalyptic number.

It is an amenable number.

20009973738473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009973738473 is an equidigital number, since it uses as much as digits as its factorization.

20009973738473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48009024, while the sum is 62.

The spelling of 20009973738473 in words is "twenty trillion, nine billion, nine hundred seventy-three million, seven hundred thirty-eight thousand, four hundred seventy-three".