20490108672 has 144 divisors (see below), whose sum is σ = 60614967168. Its totient is φ = 6091837440.

The previous prime is 20490108629. The next prime is 20490108689. The reversal of 20490108672 is 27680109402.

It is a self number, because there is not a number n which added to its sum of digits gives 20490108672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424863 + ... + 470625.

It is an arithmetic number, because the mean of its divisors is an integer number (420937272).

Almost surely, 2^20490108672 is an apocalyptic number.

20490108672 is a gapful number since it is divisible by the number (22) 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 20490108672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30307483584).

20490108672 is an abundant number, since it is smaller than the sum of its proper divisors (40124858496).

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

20490108672 is a wasteful number, since it uses less digits than its factorization.

20490108672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45846 (or 45832 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 20490108672 in words is "twenty billion, four hundred ninety million, one hundred eight thousand, six hundred seventy-two".