20305236480 has 160 divisors (see below), whose sum is σ = 65128402944. Its totient is φ = 5396791296.

The previous prime is 20305236467. The next prime is 20305236481. The reversal of 20305236480 is 8463250302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is not an unprimeable number, because it can be changed into a prime (20305236481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2399617 + ... + 2408063.

Almost surely, 2^20305236480 is an apocalyptic number.

20305236480 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 20305236480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32564201472).

20305236480 is an abundant number, since it is smaller than the sum of its proper divisors (44823166464).

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

20305236480 is an equidigital number, since it uses as much as digits as its factorization.

20305236480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8786 (or 8770 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 20305236480 its reverse (8463250302), we get a palindrome (28768486782).

The spelling of 20305236480 in words is "twenty billion, three hundred five million, two hundred thirty-six thousand, four hundred eighty".