23420404240 has 20 divisors (see below), whose sum is σ = 54452440044. Its totient is φ = 9368161664.

The previous prime is 23420404187. The next prime is 23420404243. The reversal of 23420404240 is 4240402432.

It can be written as a sum of positive squares in 2 ways, for example, as 18012860944 + 5407543296 = 134212^2 + 73536^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (23420404243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146377447 + ... + 146377606.

Almost surely, 2^23420404240 is an apocalyptic number.

23420404240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23420404240 is an abundant number, since it is smaller than the sum of its proper divisors (31032035804).

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

23420404240 is a wasteful number, since it uses less digits than its factorization.

23420404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292755066 (or 292755060 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 25.

Adding to 23420404240 its reverse (4240402432), we get a palindrome (27660806672).

The spelling of 23420404240 in words is "twenty-three billion, four hundred twenty million, four hundred four thousand, two hundred forty".