20405521320426 has 48 divisors (see below), whose sum is σ = 48583285066368. Its totient is φ = 6138356328000.

The previous prime is 20405521320421. The next prime is 20405521320461. The reversal of 20405521320426 is 62402312550402.

20405521320426 is a `hidden beast` number, since 2 + 0 + 40 + 552 + 1 + 3 + 20 + 42 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (20405521320421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 376097650 + ... + 376151901.

It is an arithmetic number, because the mean of its divisors is an integer number (1012151772216).

Almost surely, 2^{20405521320426} is an apocalyptic number.

20405521320426 is an abundant number, since it is smaller than the sum of its proper divisors (28177763745942).

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

20405521320426 is a wasteful number, since it uses less digits than its factorization.

20405521320426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752249707 (or 752249704 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 20405521320426 its reverse (62402312550402), we get a palindrome (82807833870828).

The spelling of 20405521320426 in words is "twenty trillion, four hundred five billion, five hundred twenty-one million, three hundred twenty thousand, four hundred twenty-six".