20828000399 has 2 divisors, whose sum is σ = 20828000400. Its totient is φ = 20828000398.

The previous prime is 20828000269. The next prime is 20828000407. The reversal of 20828000399 is 99300082802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20828000399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20828005399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10414000199 + 10414000200.

It is an arithmetic number, because the mean of its divisors is an integer number (10414000200).

Almost surely, 2^20828000399 is an apocalyptic number.

20828000399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20828000399 is an equidigital number, since it uses as much as digits as its factorization.

20828000399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 20828000399 in words is "twenty billion, eight hundred twenty-eight million, three hundred ninety-nine", and thus it is an aban number.