20308320240 has 640 divisors, whose sum is σ = 75235184640. Its totient is φ = 4486938624.

The previous prime is 20308320211. The next prime is 20308320247. The reversal of 20308320240 is 4202380302.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20308320240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308320247) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 103087822 + ... + 103088018.

It is an arithmetic number, because the mean of its divisors is an integer number (117554976).

Almost surely, 2^20308320240 is an apocalyptic number.

20308320240 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 20308320240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37617592320).

20308320240 is an abundant number, since it is smaller than the sum of its proper divisors (54926864400).

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

20308320240 is a wasteful number, since it uses less digits than its factorization.

20308320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The spelling of 20308320240 in words is "twenty billion, three hundred eight million, three hundred twenty thousand, two hundred forty".