19923831620 has 96 divisors (see below), whose sum is σ = 52195885056. Its totient is φ = 6206256000.

The previous prime is 19923831619. The next prime is 19923831647. The reversal of 19923831620 is 2613832991.

It is a super-2 number, since 2×19923831620² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3617789 + ... + 3623291.

It is an arithmetic number, because the mean of its divisors is an integer number (543707136).

Almost surely, 2^19923831620 is an apocalyptic number.

19923831620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19923831620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26097942528).

19923831620 is an abundant number, since it is smaller than the sum of its proper divisors (32272053436).

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

19923831620 is a wasteful number, since it uses less digits than its factorization.

19923831620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7881 (or 7879 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 19923831620 in words is "nineteen billion, nine hundred twenty-three million, eight hundred thirty-one thousand, six hundred twenty".