20403226520430 has 256 divisors, whose sum is σ = 55436943614976. Its totient is φ = 4772039086080.

The previous prime is 20403226520393. The next prime is 20403226520441. The reversal of 20403226520430 is 3402562230402.

It is a junction number, because it is equal to n+sod(n) for n = 20403226520391 and 20403226520400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 238544032 + ... + 238629548.

It is an arithmetic number, because the mean of its divisors is an integer number (216550560996).

Almost surely, 2^{20403226520430} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403226520430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27718471807488).

20403226520430 is an abundant number, since it is smaller than the sum of its proper divisors (35033717094546).

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

20403226520430 is a wasteful number, since it uses less digits than its factorization.

20403226520430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85971.

The product of its (nonzero) digits is 69120, while the sum is 33.

Adding to 20403226520430 its reverse (3402562230402), we get a palindrome (23805788750832).

The spelling of 20403226520430 in words is "twenty trillion, four hundred three billion, two hundred twenty-six million, five hundred twenty thousand, four hundred thirty".