20381205120270 has 128 divisors (see below), whose sum is σ = 51608233797120. Its totient is φ = 5137058880000.

The previous prime is 20381205120257. The next prime is 20381205120281. The reversal of 20381205120270 is 7202150218302.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 618702000 + ... + 618734940.

It is an arithmetic number, because the mean of its divisors is an integer number (403189326540).

Almost surely, 2^{20381205120270} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20381205120270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25804116898560).

20381205120270 is an abundant number, since it is smaller than the sum of its proper divisors (31227028676850).

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

20381205120270 is a wasteful number, since it uses less digits than its factorization.

20381205120270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35442.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 20381205120270 its reverse (7202150218302), we get a palindrome (27583355338572).

The spelling of 20381205120270 in words is "twenty trillion, three hundred eighty-one billion, two hundred five million, one hundred twenty thousand, two hundred seventy".