20398015872 has 384 divisors, whose sum is σ = 66563078400. Its totient is φ = 5952061440.

The previous prime is 20398015861. The next prime is 20398015889. The reversal of 20398015872 is 27851089302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24605154 + ... + 24605982.

It is an arithmetic number, because the mean of its divisors is an integer number (173341350).

Almost surely, 2^20398015872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20398015872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33281539200).

20398015872 is an abundant number, since it is smaller than the sum of its proper divisors (46165062528).

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

20398015872 is a wasteful number, since it uses less digits than its factorization.

20398015872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 20398015872 in words is "twenty billion, three hundred ninety-eight million, fifteen thousand, eight hundred seventy-two".