20939424480 has 1152 divisors, whose sum is σ = 87657292800. Its totient is φ = 4649508864.

The previous prime is 20939424427. The next prime is 20939424481. The reversal of 20939424480 is 8442493902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939424481) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 486963339 + ... + 486963381.

It is an arithmetic number, because the mean of its divisors is an integer number (76091400).

Almost surely, 2^20939424480 is an apocalyptic number.

20939424480 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 20939424480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43828646400).

20939424480 is an abundant number, since it is smaller than the sum of its proper divisors (66717868320).

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

20939424480 is a wasteful number, since it uses less digits than its factorization.

20939424480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 20939424480 in words is "twenty billion, nine hundred thirty-nine million, four hundred twenty-four thousand, four hundred eighty".