820396547039 has 16 divisors (see below), whose sum is σ = 854743307040. Its totient is φ = 786735459840.

The previous prime is 820396547011. The next prime is 820396547057. The reversal of 820396547039 is 930745693028.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820396547039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820399547039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42557507 + ... + 42576779.

It is an arithmetic number, because the mean of its divisors is an integer number (53421456690).

Almost surely, 2^820396547039 is an apocalyptic number.

820396547039 is a deficient number, since it is larger than the sum of its proper divisors (34346760001).

820396547039 is a wasteful number, since it uses less digits than its factorization.

820396547039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36970.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The spelling of 820396547039 in words is "eight hundred twenty billion, three hundred ninety-six million, five hundred forty-seven thousand, thirty-nine".