820955317400 has 48 divisors (see below), whose sum is σ = 2009180128200. Its totient is φ = 311098855680.

The previous prime is 820955317349. The next prime is 820955317417. The reversal of 820955317400 is 4713559028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108016637 + ... + 108024236.

Almost surely, 2^820955317400 is an apocalyptic number.

It is an amenable number.

820955317400 is an abundant number, since it is smaller than the sum of its proper divisors (1188224810800).

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

820955317400 is a wasteful number, since it uses less digits than its factorization.

820955317400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216040908 (or 216040899 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 820955317400 in words is "eight hundred twenty billion, nine hundred fifty-five million, three hundred seventeen thousand, four hundred".