20844647040 has 384 divisors, whose sum is σ = 77861088000. Its totient is φ = 4729331712.

The previous prime is 20844647029. The next prime is 20844647051. The reversal of 20844647040 is 4074644802.

It is an interprime number because it is at equal distance from previous prime (20844647029) and next prime (20844647051).

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

It is a self number, because there is not a number n which added to its sum of digits gives 20844647040.

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, 14017177 + ... + 14018663.

It is an arithmetic number, because the mean of its divisors is an integer number (202763250).

Almost surely, 2^20844647040 is an apocalyptic number.

20844647040 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 20844647040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38930544000).

20844647040 is an abundant number, since it is smaller than the sum of its proper divisors (57016440960).

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

20844647040 is a wasteful number, since it uses less digits than its factorization.

20844647040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1653 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 39.

The spelling of 20844647040 in words is "twenty billion, eight hundred forty-four million, six hundred forty-seven thousand, forty".