20004310221566 has 64 divisors (see below), whose sum is σ = 34930392134400. Its totient is φ = 8496340128000.

The previous prime is 20004310221559. The next prime is 20004310221601. The reversal of 20004310221566 is 66512201340002.

It is a super-2 number, since 2×20004310221566² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20371400 + ... + 21330788.

It is an arithmetic number, because the mean of its divisors is an integer number (545787377100).

Almost surely, 2^{20004310221566} is an apocalyptic number.

20004310221566 is a deficient number, since it is larger than the sum of its proper divisors (14926081912834).

20004310221566 is a wasteful number, since it uses less digits than its factorization.

20004310221566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960105.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 20004310221566 its reverse (66512201340002), we get a palindrome (86516511561568).

The spelling of 20004310221566 in words is "twenty trillion, four billion, three hundred ten million, two hundred twenty-one thousand, five hundred sixty-six".