20540203401456 has 80 divisors (see below), whose sum is σ = 58984708070400. Its totient is φ = 6843631868352.

The previous prime is 20540203401449. The next prime is 20540203401457. The reversal of 20540203401456 is 65410430204502.

20540203401456 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 0 + 203 + 401 + 45 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20540203401456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540203401457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9818386 + ... + 11725233.

It is an arithmetic number, because the mean of its divisors is an integer number (737308850880).

Almost surely, 2^{20540203401456} is an apocalyptic number.

It is an amenable number.

20540203401456 is an abundant number, since it is smaller than the sum of its proper divisors (38444504668944).

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

20540203401456 is a wasteful number, since it uses less digits than its factorization.

20540203401456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21545843 (or 21545831 counting only the distinct ones).

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

Adding to 20540203401456 its reverse (65410430204502), we get a palindrome (85950633605958).

The spelling of 20540203401456 in words is "twenty trillion, five hundred forty billion, two hundred three million, four hundred one thousand, four hundred fifty-six".