20031987842340 has 384 divisors, whose sum is σ = 64564833231360. Its totient is φ = 4613223186432.

The previous prime is 20031987842329. The next prime is 20031987842351. The reversal of 20031987842340 is 4324878913002.

It is an interprime number because it is at equal distance from previous prime (20031987842329) and next prime (20031987842351).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 46848954 + ... + 47274606.

It is an arithmetic number, because the mean of its divisors is an integer number (168137586540).

Almost surely, 2^{20031987842340} is an apocalyptic number.

20031987842340 is a gapful number since it is divisible by the number (20) 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 20031987842340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32282416615680).

20031987842340 is an abundant number, since it is smaller than the sum of its proper divisors (44532845389020).

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

20031987842340 is a wasteful number, since it uses less digits than its factorization.

20031987842340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425791 (or 425789 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 20031987842340 in words is "twenty trillion, thirty-one billion, nine hundred eighty-seven million, eight hundred forty-two thousand, three hundred forty".