820194437500 has 42 divisors (see below), whose sum is σ = 1794152503304. Its totient is φ = 328077750000.

The previous prime is 820194437467. The next prime is 820194437507. The reversal of 820194437500 is 5734491028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820194437507) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 6499056 + ... + 6624055.

Almost surely, 2^820194437500 is an apocalyptic number.

It is an amenable number.

820194437500 is an abundant number, since it is smaller than the sum of its proper divisors (973958065804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820194437500 is an equidigital number, since it uses as much as digits as its factorization.

820194437500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13123145 (or 13123118 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 820194437500 in words is "eight hundred twenty billion, one hundred ninety-four million, four hundred thirty-seven thousand, five hundred".