20496464640 has 288 divisors, whose sum is σ = 73414756800. Its totient is φ = 5414584320.

The previous prime is 20496464629. The next prime is 20496464657. The reversal of 20496464640 is 4646469402.

It is a tau number, because it is divible by the number of its divisors (288).

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

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, 3764320 + ... + 3769760.

It is an arithmetic number, because the mean of its divisors is an integer number (254912350).

Almost surely, 2^20496464640 is an apocalyptic number.

20496464640 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 20496464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36707378400).

20496464640 is an abundant number, since it is smaller than the sum of its proper divisors (52918292160).

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

20496464640 is a wasteful number, since it uses less digits than its factorization.

20496464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580 (or 5560 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The spelling of 20496464640 in words is "twenty billion, four hundred ninety-six million, four hundred sixty-four thousand, six hundred forty".