20355253511064 has 128 divisors (see below), whose sum is σ = 54031708938240. Its totient is φ = 6368171620352.

The previous prime is 20355253511063. The next prime is 20355253511069. The reversal of 20355253511064 is 46011535255302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355253511063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1723117222 + ... + 1723129034.

It is an arithmetic number, because the mean of its divisors is an integer number (422122726080).

Almost surely, 2^{20355253511064} is an apocalyptic number.

20355253511064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20355253511064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27015854469120).

20355253511064 is an abundant number, since it is smaller than the sum of its proper divisors (33676455427176).

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

20355253511064 is a wasteful number, since it uses less digits than its factorization.

20355253511064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23249 (or 23245 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 20355253511064 its reverse (46011535255302), we get a palindrome (66366788766366).

The spelling of 20355253511064 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, five hundred eleven thousand, sixty-four".