20859807744 has 384 divisors, whose sum is σ = 65499033600. Its totient is φ = 6549258240.

The previous prime is 20859807707. The next prime is 20859807751. The reversal of 20859807744 is 44770895802.

It is a happy number.

20859807744 is a `hidden beast` number, since 2 + 0 + 8 + 598 + 0 + 7 + 7 + 44 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 73709427 + ... + 73709709.

It is an arithmetic number, because the mean of its divisors is an integer number (170570400).

Almost surely, 2^20859807744 is an apocalyptic number.

20859807744 is a gapful number since it is divisible by the number (24) 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 20859807744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32749516800).

20859807744 is an abundant number, since it is smaller than the sum of its proper divisors (44639225856).

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

20859807744 is a wasteful number, since it uses less digits than its factorization.

20859807744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 20859807744 in words is "twenty billion, eight hundred fifty-nine million, eight hundred seven thousand, seven hundred forty-four".