20404020040 has 32 divisors (see below), whose sum is σ = 45940815360. Its totient is φ = 8155960000.

The previous prime is 20404020019. The next prime is 20404020047. The reversal of 20404020040 is 4002040402.

It is a junction number, because it is equal to n+sod(n) for n = 20404019996 and 20404020023.

It is not an unprimeable number, because it can be changed into a prime (20404020047) 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, 117736 + ... + 233815.

It is an arithmetic number, because the mean of its divisors is an integer number (1435650480).

Almost surely, 2^20404020040 is an apocalyptic number.

20404020040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404020040 is an abundant number, since it is smaller than the sum of its proper divisors (25536795320).

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

20404020040 is a wasteful number, since it uses less digits than its factorization.

20404020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353013 (or 353009 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20404020040 its reverse (4002040402), we get a palindrome (24406060442).

The spelling of 20404020040 in words is "twenty billion, four hundred four million, twenty thousand, forty".