20145422440 has 64 divisors (see below), whose sum is σ = 53251551360. Its totient is φ = 6762097920.

The previous prime is 20145422419. The next prime is 20145422441. The reversal of 20145422440 is 4422454102.

It is a junction number, because it is equal to n+sod(n) for n = 20145422399 and 20145422408.

It is not an unprimeable number, because it can be changed into a prime (20145422441) 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, 1755244 + ... + 1766683.

It is an arithmetic number, because the mean of its divisors is an integer number (832055490).

Almost surely, 2^20145422440 is an apocalyptic number.

20145422440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145422440 is an abundant number, since it is smaller than the sum of its proper divisors (33106128920).

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

20145422440 is a wasteful number, since it uses less digits than its factorization.

20145422440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3521962 (or 3521958 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 20145422440 its reverse (4422454102), we get a palindrome (24567876542).

The spelling of 20145422440 in words is "twenty billion, one hundred forty-five million, four hundred twenty-two thousand, four hundred forty".