20211989280 has 192 divisors, whose sum is σ = 72973571328. Its totient is φ = 4606525440.

The previous prime is 20211989279. The next prime is 20211989311. The reversal of 20211989280 is 8298911202.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1177560 + ... + 1194600.

It is an arithmetic number, because the mean of its divisors is an integer number (380070684).

Almost surely, 2^20211989280 is an apocalyptic number.

20211989280 is a gapful number since it is divisible by the number (20) 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 20211989280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36486785664).

20211989280 is an abundant number, since it is smaller than the sum of its proper divisors (52761582048).

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

20211989280 is a wasteful number, since it uses less digits than its factorization.

20211989280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17419 (or 17411 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 20211989280 in words is "twenty billion, two hundred eleven million, nine hundred eighty-nine thousand, two hundred eighty".