20423444240 has 40 divisors (see below), whose sum is σ = 47693733120. Its totient is φ = 8133382016.

The previous prime is 20423444233. The next prime is 20423444281. The reversal of 20423444240 is 4244432402.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544160 + ... + 580479.

It is an arithmetic number, because the mean of its divisors is an integer number (1192343328).

Almost surely, 2^20423444240 is an apocalyptic number.

20423444240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423444240 is an abundant number, since it is smaller than the sum of its proper divisors (27270288880).

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

20423444240 is a wasteful number, since it uses less digits than its factorization.

20423444240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124879 (or 1124873 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 29.

Adding to 20423444240 its reverse (4244432402), we get a palindrome (24667876642).

The spelling of 20423444240 in words is "twenty billion, four hundred twenty-three million, four hundred forty-four thousand, two hundred forty".