20450243340 has 120 divisors (see below), whose sum is σ = 64418415600. Its totient is φ = 5453293248.

The previous prime is 20450243329. The next prime is 20450243353. The reversal of 20450243340 is 4334205402.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 367686 + ... + 419634.

It is an arithmetic number, because the mean of its divisors is an integer number (536820130).

Almost surely, 2^20450243340 is an apocalyptic number.

20450243340 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 20450243340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32209207800).

20450243340 is an abundant number, since it is smaller than the sum of its proper divisors (43968172260).

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

20450243340 is an frugal number, since it uses more digits than its factorization.

20450243340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51985 (or 51959 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

Adding to 20450243340 its reverse (4334205402), we get a palindrome (24784448742).

The spelling of 20450243340 in words is "twenty billion, four hundred fifty million, two hundred forty-three thousand, three hundred forty".