20021489871738 has 8 divisors (see below), whose sum is σ = 40042979743488. Its totient is φ = 6673829957244.

The previous prime is 20021489871709. The next prime is 20021489871781. The reversal of 20021489871738 is 83717898412002.

It is a sphenic number, since it is the product of 3 distinct primes.

20021489871738 is an admirable number.

It is a super-2 number, since 2×20021489871738² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668457489306 + ... + 1668457489317.

It is an arithmetic number, because the mean of its divisors is an integer number (5005372467936).

Almost surely, 2^{20021489871738} is an apocalyptic number.

20021489871738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20021489871738 is a wasteful number, since it uses less digits than its factorization.

20021489871738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336914978628.

The product of its (nonzero) digits is 10838016, while the sum is 60.

The spelling of 20021489871738 in words is "twenty trillion, twenty-one billion, four hundred eighty-nine million, eight hundred seventy-one thousand, seven hundred thirty-eight".