20506066571536 has 80 divisors (see below), whose sum is σ = 48913642465408. Its totient is φ = 8109874483200.

The previous prime is 20506066571527. The next prime is 20506066571567. The reversal of 20506066571536 is 63517566060502.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2798431 + ... + 6988801.

Almost surely, 2^{20506066571536} is an apocalyptic number.

20506066571536 is a gapful number since it is divisible by the number (26) 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 20506066571536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24456821232704).

20506066571536 is an abundant number, since it is smaller than the sum of its proper divisors (28407575893872).

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

20506066571536 is a wasteful number, since it uses less digits than its factorization.

20506066571536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193760 (or 4193754 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 52.

The spelling of 20506066571536 in words is "twenty trillion, five hundred six billion, sixty-six million, five hundred seventy-one thousand, five hundred thirty-six".