20448393140 has 24 divisors (see below), whose sum is σ = 49076143872. Its totient is φ = 7010877600.

The previous prime is 20448393139. The next prime is 20448393149. The reversal of 20448393140 is 4139384402.

It is a junction number, because it is equal to n+sod(n) for n = 20448393094 and 20448393103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448393149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73029836 + ... + 73030115.

It is an arithmetic number, because the mean of its divisors is an integer number (2044839328).

Almost surely, 2^20448393140 is an apocalyptic number.

20448393140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20448393140 is an abundant number, since it is smaller than the sum of its proper divisors (28627750732).

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

20448393140 is a wasteful number, since it uses less digits than its factorization.

20448393140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146059967 (or 146059965 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 20448393140 in words is "twenty billion, four hundred forty-eight million, three hundred ninety-three thousand, one hundred forty".