20340234640 has 80 divisors (see below), whose sum is σ = 51612500160. Its totient is φ = 7393256960.

The previous prime is 20340234587. The next prime is 20340234641. The reversal of 20340234640 is 4643204302.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 20340234599 and 20340234608.

It is not an unprimeable number, because it can be changed into a prime (20340234641) 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, 3216762 + ... + 3223078.

It is an arithmetic number, because the mean of its divisors is an integer number (645156252).

Almost surely, 2^20340234640 is an apocalyptic number.

20340234640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340234640 is an abundant number, since it is smaller than the sum of its proper divisors (31272265520).

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

20340234640 is a wasteful number, since it uses less digits than its factorization.

20340234640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000 (or 9994 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20340234640 its reverse (4643204302), we get a palindrome (24983438942).

The spelling of 20340234640 in words is "twenty billion, three hundred forty million, two hundred thirty-four thousand, six hundred forty".