20198873856 has 288 divisors, whose sum is σ = 66768486400. Its totient is φ = 5290168320.

The previous prime is 20198873809. The next prime is 20198873869. The reversal of 20198873856 is 65837889102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 20198873796 and 20198873805.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3163275 + ... + 3169653.

Almost surely, 2^20198873856 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 20198873856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33384243200).

20198873856 is an abundant number, since it is smaller than the sum of its proper divisors (46569612544).

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

20198873856 is a wasteful number, since it uses less digits than its factorization.

20198873856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455 (or 6441 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 20198873856 in words is "twenty billion, one hundred ninety-eight million, eight hundred seventy-three thousand, eight hundred fifty-six".