20217942504166 has 32 divisors (see below), whose sum is σ = 34537757184000. Its totient is φ = 8786483249280.

The previous prime is 20217942504119. The next prime is 20217942504181. The reversal of 20217942504166 is 66140524971202.

It is a congruent number.

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, 7789891 + ... + 10055758.

It is an arithmetic number, because the mean of its divisors is an integer number (1079304912000).

Almost surely, 2^{20217942504166} is an apocalyptic number.

20217942504166 is a deficient number, since it is larger than the sum of its proper divisors (14319814679834).

20217942504166 is a wasteful number, since it uses less digits than its factorization.

20217942504166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17847924.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 20217942504166 in words is "twenty trillion, two hundred seventeen billion, nine hundred forty-two million, five hundred four thousand, one hundred sixty-six".