20669457439530 has 192 divisors, whose sum is σ = 54888770327040. Its totient is φ = 5394620694528.

The previous prime is 20669457439511. The next prime is 20669457439531. The reversal of 20669457439530 is 3593475496602.

20669457439530 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 9 + 4 + 57 + 43 + 9 + 530 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20669457439531) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3954360777 + ... + 3954366003.

It is an arithmetic number, because the mean of its divisors is an integer number (285879012120).

Almost surely, 2^{20669457439530} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20669457439530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27444385163520).

20669457439530 is an abundant number, since it is smaller than the sum of its proper divisors (34219312887510).

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

20669457439530 is a wasteful number, since it uses less digits than its factorization.

20669457439530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165 (or 7162 counting only the distinct ones).

The product of its (nonzero) digits is 146966400, while the sum is 63.

The spelling of 20669457439530 in words is "twenty trillion, six hundred sixty-nine billion, four hundred fifty-seven million, four hundred thirty-nine thousand, five hundred thirty".