20420235567660 has 96 divisors (see below), whose sum is σ = 57534788424960. Its totient is φ = 5411297187072.

The previous prime is 20420235567659. The next prime is 20420235567679. The reversal of 20420235567660 is 6676553202402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78785439 + ... + 79044201.

It is an arithmetic number, because the mean of its divisors is an integer number (599320712760).

Almost surely, 2^{20420235567660} is an apocalyptic number.

20420235567660 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 20420235567660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28767394212480).

20420235567660 is an abundant number, since it is smaller than the sum of its proper divisors (37114552857300).

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

20420235567660 is a wasteful number, since it uses less digits than its factorization.

20420235567660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267007 (or 267005 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 48.

The spelling of 20420235567660 in words is "twenty trillion, four hundred twenty billion, two hundred thirty-five million, five hundred sixty-seven thousand, six hundred sixty".