20109949440 has 160 divisors (see below), whose sum is σ = 73473333120. Its totient is φ = 4596547584.

The previous prime is 20109949393. The next prime is 20109949463. The reversal of 20109949440 is 4494990102.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 20109949392 and 20109949401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133275 + ... + 240794.

It is an arithmetic number, because the mean of its divisors is an integer number (459208332).

Almost surely, 2^20109949440 is an apocalyptic number.

20109949440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20109949440 is an abundant number, since it is smaller than the sum of its proper divisors (53363383680).

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

20109949440 is an equidigital number, since it uses as much as digits as its factorization.

20109949440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374102 (or 374086 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 20109949440 in words is "twenty billion, one hundred nine million, nine hundred forty-nine thousand, four hundred forty".