20005445540 has 48 divisors (see below), whose sum is σ = 44117402112. Its totient is φ = 7605476736.

The previous prime is 20005445479. The next prime is 20005445597. The reversal of 20005445540 is 4554450002.

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, 66284 + ... + 210723.

It is an arithmetic number, because the mean of its divisors is an integer number (919112544).

Almost surely, 2^20005445540 is an apocalyptic number.

20005445540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005445540 is an abundant number, since it is smaller than the sum of its proper divisors (24111956572).

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

20005445540 is a wasteful number, since it uses less digits than its factorization.

20005445540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277196 (or 277194 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 29.

Adding to 20005445540 its reverse (4554450002), we get a palindrome (24559895542).

The spelling of 20005445540 in words is "twenty billion, five million, four hundred forty-five thousand, five hundred forty".