20889790740 has 576 divisors, whose sum is σ = 84316377600. Its totient is φ = 4145541120.

The previous prime is 20889790729. The next prime is 20889790763. The reversal of 20889790740 is 4709798802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 13643775 + ... + 13645305.

It is an arithmetic number, because the mean of its divisors is an integer number (146382600).

Almost surely, 2^20889790740 is an apocalyptic number.

20889790740 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 20889790740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42158188800).

20889790740 is an abundant number, since it is smaller than the sum of its proper divisors (63426586860).

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

20889790740 is a wasteful number, since it uses less digits than its factorization.

20889790740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597 (or 1578 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 20889790740 in words is "twenty billion, eight hundred eighty-nine million, seven hundred ninety thousand, seven hundred forty".