20644734435000 has 320 divisors, whose sum is σ = 69525557824800. Its totient is φ = 5076635904000.

The previous prime is 20644734434983. The next prime is 20644734435001. The reversal of 20644734435000 is 53443744602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644734435001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 194361906 + ... + 194468094.

Almost surely, 2^{20644734435000} is an apocalyptic number.

20644734435000 is a gapful number since it is divisible by the number (20) 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 20644734435000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34762778912400).

20644734435000 is an abundant number, since it is smaller than the sum of its proper divisors (48880823389800).

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

20644734435000 is a wasteful number, since it uses less digits than its factorization.

20644734435000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107228 (or 107209 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 42.

The spelling of 20644734435000 in words is "twenty trillion, six hundred forty-four billion, seven hundred thirty-four million, four hundred thirty-five thousand".