20643527329992 has 64 divisors (see below), whose sum is σ = 65535007401600. Its totient is φ = 5898150665280.

The previous prime is 20643527329979. The next prime is 20643527329993. The reversal of 20643527329992 is 29992372534602.

20643527329992 is a `hidden beast` number, since 2 + 0 + 6 + 435 + 27 + 3 + 2 + 99 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20643527329993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6826561759 + ... + 6826564782.

It is an arithmetic number, because the mean of its divisors is an integer number (1023984490650).

Almost surely, 2^{20643527329992} is an apocalyptic number.

It is an amenable number.

20643527329992 is an abundant number, since it is smaller than the sum of its proper divisors (44891480071608).

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

20643527329992 is a wasteful number, since it uses less digits than its factorization.

20643527329992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13653126563 (or 13653126553 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 63.

The spelling of 20643527329992 in words is "twenty trillion, six hundred forty-three billion, five hundred twenty-seven million, three hundred twenty-nine thousand, nine hundred ninety-two".