20006220040 has 16 divisors (see below), whose sum is σ = 45013995180. Its totient is φ = 8002488000.

The previous prime is 20006220029. The next prime is 20006220043. The reversal of 20006220040 is 4002260002.

It can be written as a sum of positive squares in 2 ways, for example, as 19960603524 + 45616516 = 141282^2 + 6754^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20006219996 and 20006220023.

It is not an unprimeable number, because it can be changed into a prime (20006220043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250077711 + ... + 250077790.

Almost surely, 2^20006220040 is an apocalyptic number.

20006220040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20006220040 is an abundant number, since it is smaller than the sum of its proper divisors (25007775140).

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

20006220040 is a wasteful number, since it uses less digits than its factorization.

20006220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500155512 (or 500155508 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20006220040 its reverse (4002260002), we get a palindrome (24008480042).

The spelling of 20006220040 in words is "twenty billion, six million, two hundred twenty thousand, forty".