20720258784 has 240 divisors, whose sum is σ = 67920930000. Its totient is φ = 6158094336.

The previous prime is 20720258747. The next prime is 20720258827. The reversal of 20720258784 is 48785202702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 824842 + ... + 849590.

It is an arithmetic number, because the mean of its divisors is an integer number (283003875).

Almost surely, 2^20720258784 is an apocalyptic number.

20720258784 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 20720258784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33960465000).

20720258784 is an abundant number, since it is smaller than the sum of its proper divisors (47200671216).

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

20720258784 is a wasteful number, since it uses less digits than its factorization.

20720258784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24807 (or 24790 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 45.

The spelling of 20720258784 in words is "twenty billion, seven hundred twenty million, two hundred fifty-eight thousand, seven hundred eighty-four".