20511203001234 has 64 divisors (see below), whose sum is σ = 45235570988160. Its totient is φ = 6148424960000.

The previous prime is 20511203001229. The next prime is 20511203001241. The reversal of 20511203001234 is 43210030211502.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6005314 + ... + 8779874.

It is an arithmetic number, because the mean of its divisors is an integer number (706805796690).

Almost surely, 2^{20511203001234} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20511203001234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22617785494080).

20511203001234 is an abundant number, since it is smaller than the sum of its proper divisors (24724367986926).

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

20511203001234 is a wasteful number, since it uses less digits than its factorization.

20511203001234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775787.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20511203001234 its reverse (43210030211502), we get a palindrome (63721233212736).

The spelling of 20511203001234 in words is "twenty trillion, five hundred eleven billion, two hundred three million, one thousand, two hundred thirty-four".