20440004399 has 2 divisors, whose sum is σ = 20440004400. Its totient is φ = 20440004398.

The previous prime is 20440004371. The next prime is 20440004423. The reversal of 20440004399 is 99340004402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20440004399 is a prime.

It is a super-2 number, since 2×20440004399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440004339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220002199 + 10220002200.

It is an arithmetic number, because the mean of its divisors is an integer number (10220002200).

Almost surely, 2^20440004399 is an apocalyptic number.

20440004399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440004399 is an equidigital number, since it uses as much as digits as its factorization.

20440004399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 20440004399 in words is "twenty billion, four hundred forty million, four thousand, three hundred ninety-nine".