20884209040 has 80 divisors (see below), whose sum is σ = 50622884928. Its totient is φ = 8005390848.

The previous prime is 20884209023. The next prime is 20884209077. The reversal of 20884209040 is 4090248802.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125047 + ... + 239593.

Almost surely, 2^20884209040 is an apocalyptic number.

20884209040 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 20884209040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25311442464).

20884209040 is an abundant number, since it is smaller than the sum of its proper divisors (29738675888).

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

20884209040 is a wasteful number, since it uses less digits than its factorization.

20884209040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114656 (or 114650 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 20884209040 in words is "twenty billion, eight hundred eighty-four million, two hundred nine thousand, forty".