20400442204420 has 24 divisors (see below), whose sum is σ = 42857463253248. Its totient is φ = 8157027429600.

The previous prime is 20400442204349. The next prime is 20400442204427. The reversal of 20400442204420 is 2440224400402.

It is not an unprimeable number, because it can be changed into a prime (20400442204427) 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, 196787646 + ... + 196891285.

It is an arithmetic number, because the mean of its divisors is an integer number (1785727635552).

Almost surely, 2^{20400442204420} is an apocalyptic number.

20400442204420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400442204420 is an abundant number, since it is smaller than the sum of its proper divisors (22457021048828).

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

20400442204420 is a wasteful number, since it uses less digits than its factorization.

20400442204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393681531 (or 393681529 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20400442204420 its reverse (2440224400402), we get a palindrome (22840666604822).

The spelling of 20400442204420 in words is "twenty trillion, four hundred billion, four hundred forty-two million, two hundred four thousand, four hundred twenty".