820631141556 has 48 divisors (see below), whose sum is σ = 1918298171328. Its totient is φ = 273045081600.

The previous prime is 820631141419. The next prime is 820631141557. The reversal of 820631141556 is 655141136028.

It is a super-2 number, since 2×820631141556² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820631141557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30789996 + ... + 30816636.

It is an arithmetic number, because the mean of its divisors is an integer number (39964545236).

Almost surely, 2^820631141556 is an apocalyptic number.

It is an amenable number.

820631141556 is an abundant number, since it is smaller than the sum of its proper divisors (1097667029772).

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

820631141556 is a wasteful number, since it uses less digits than its factorization.

820631141556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31232 (or 31230 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 820631141556 in words is "eight hundred twenty billion, six hundred thirty-one million, one hundred forty-one thousand, five hundred fifty-six".