20027721066 has 16 divisors (see below), whose sum is σ = 40057178304. Its totient is φ = 6675617664.

The previous prime is 20027721053. The next prime is 20027721067. The reversal of 20027721066 is 66012772002.

It is a super-2 number, since 2×20027721066² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20027721067) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 114906 + ... + 230778.

It is an arithmetic number, because the mean of its divisors is an integer number (2503573644).

Almost surely, 2^20027721066 is an apocalyptic number.

20027721066 is an abundant number, since it is smaller than the sum of its proper divisors (20029457238).

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

20027721066 is a wasteful number, since it uses less digits than its factorization.

20027721066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144685.

The product of its (nonzero) digits is 14112, while the sum is 33.

The spelling of 20027721066 in words is "twenty billion, twenty-seven million, seven hundred twenty-one thousand, sixty-six".