20457284399 has 2 divisors, whose sum is σ = 20457284400. Its totient is φ = 20457284398.

The previous prime is 20457284387. The next prime is 20457284411. The reversal of 20457284399 is 99348275402.

It is a balanced prime because it is at equal distance from previous prime (20457284387) and next prime (20457284411).

It is a cyclic number.

It is not a de Polignac number, because 20457284399 - 2²⁴ = 20440507183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20457284399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20457284329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228642199 + 10228642200.

It is an arithmetic number, because the mean of its divisors is an integer number (10228642200).

Almost surely, 2^20457284399 is an apocalyptic number.

20457284399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20457284399 is an equidigital number, since it uses as much as digits as its factorization.

20457284399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 20457284399 in words is "twenty billion, four hundred fifty-seven million, two hundred eighty-four thousand, three hundred ninety-nine".