20001549631998 has 16 divisors (see below), whose sum is σ = 43639744651776. Its totient is φ = 6061075646040.

The previous prime is 20001549631993. The next prime is 20001549632047. The reversal of 20001549631998 is 89913694510002.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001549631993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151526891086 + ... + 151526891217.

It is an arithmetic number, because the mean of its divisors is an integer number (2727484040736).

Almost surely, 2^{20001549631998} is an apocalyptic number.

20001549631998 is an abundant number, since it is smaller than the sum of its proper divisors (23638195019778).

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

20001549631998 is a wasteful number, since it uses less digits than its factorization.

20001549631998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303053782319.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 20001549631998 in words is "twenty trillion, one billion, five hundred forty-nine million, six hundred thirty-one thousand, nine hundred ninety-eight".