20404020400000 has 96 divisors (see below), whose sum is σ = 50807542093560. Its totient is φ = 8161608000000.

The previous prime is 20404020399839. The next prime is 20404020400003. The reversal of 20404020400000 is 402040402.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404020400003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25105026 + ... + 25905025.

Almost surely, 2^{20404020400000} is an apocalyptic number.

20404020400000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404020400000 is an abundant number, since it is smaller than the sum of its proper divisors (30403521693560).

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

20404020400000 is an frugal number, since it uses more digits than its factorization.

20404020400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51010090 (or 51010058 counting only the distinct ones).

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

Adding to 20404020400000 its reverse (402040402), we get a palindrome (20404422440402).

The spelling of 20404020400000 in words is "twenty trillion, four hundred four billion, twenty million, four hundred thousand".