19700331840 has 448 divisors, whose sum is σ = 79776645120. Its totient is φ = 4483123200.

The previous prime is 19700331839. The next prime is 19700331851. The reversal of 19700331840 is 4813300791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a super-2 number, since 2×19700331840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19700331795 and 19700331804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17115265 + ... + 17116415.

Almost surely, 2^19700331840 is an apocalyptic number.

19700331840 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 19700331840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39888322560).

19700331840 is an abundant number, since it is smaller than the sum of its proper divisors (60076313280).

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

19700331840 is a wasteful number, since it uses less digits than its factorization.

19700331840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 19700331840 in words is "nineteen billion, seven hundred million, three hundred thirty-one thousand, eight hundred forty".