20001020201988 has 96 divisors (see below), whose sum is σ = 53572959068160. Its totient is φ = 5689198235520.

The previous prime is 20001020201983. The next prime is 20001020202001. The reversal of 20001020201988 is 88910202010002.

It is not an unprimeable number, because it can be changed into a prime (20001020201983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331425345 + ... + 331485687.

It is an arithmetic number, because the mean of its divisors is an integer number (558051656960).

Almost surely, 2^{20001020201988} is an apocalyptic number.

20001020201988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20001020201988 is an abundant number, since it is smaller than the sum of its proper divisors (33571938866172).

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

20001020201988 is a wasteful number, since it uses less digits than its factorization.

20001020201988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77817 (or 77815 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The spelling of 20001020201988 in words is "twenty trillion, one billion, twenty million, two hundred one thousand, nine hundred eighty-eight".