20402443213393 has 2 divisors, whose sum is σ = 20402443213394. Its totient is φ = 20402443213392.

The previous prime is 20402443213283. The next prime is 20402443213409. The reversal of 20402443213393 is 39331234420402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18302242284544 + 2100200928849 = 4278112^2 + 1449207^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402443213393 - 2⁴¹ = 18203419957841 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402443214393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201221606696 + 10201221606697.

It is an arithmetic number, because the mean of its divisors is an integer number (10201221606697).

Almost surely, 2^{20402443213393} is an apocalyptic number.

It is an amenable number.

20402443213393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402443213393 is an equidigital number, since it uses as much as digits as its factorization.

20402443213393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 40.

Adding to 20402443213393 its reverse (39331234420402), we get a palindrome (59733677633795).

The spelling of 20402443213393 in words is "twenty trillion, four hundred two billion, four hundred forty-three million, two hundred thirteen thousand, three hundred ninety-three".