20219494440389 has 2 divisors, whose sum is σ = 20219494440390. Its totient is φ = 20219494440388.

The previous prime is 20219494440331. The next prime is 20219494440469. The reversal of 20219494440389 is 98304449491202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10831043013025 + 9388451427364 = 3291055^2 + 3064058^2 .

It is a cyclic number.

It is not a de Polignac number, because 20219494440389 - 2²⁴ = 20219477663173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20219494440319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109747220194 + 10109747220195.

It is an arithmetic number, because the mean of its divisors is an integer number (10109747220195).

Almost surely, 2^{20219494440389} is an apocalyptic number.

It is an amenable number.

20219494440389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219494440389 is an equidigital number, since it uses as much as digits as its factorization.

20219494440389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17915904, while the sum is 59.

The spelling of 20219494440389 in words is "twenty trillion, two hundred nineteen billion, four hundred ninety-four million, four hundred forty thousand, three hundred eighty-nine".