20354631165566 has 16 divisors (see below), whose sum is σ = 30547519580160. Its totient is φ = 10172125708920.

The previous prime is 20354631165469. The next prime is 20354631165577. The reversal of 20354631165566 is 66556113645302.

It is a super-2 number, since 2×20354631165566² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38494031 + ... + 39019221.

It is an arithmetic number, because the mean of its divisors is an integer number (1909219973760).

Almost surely, 2^{20354631165566} is an apocalyptic number.

20354631165566 is a deficient number, since it is larger than the sum of its proper divisors (10192888414594).

20354631165566 is a wasteful number, since it uses less digits than its factorization.

20354631165566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535039.

The product of its (nonzero) digits is 11664000, while the sum is 53.

The spelling of 20354631165566 in words is "twenty trillion, three hundred fifty-four billion, six hundred thirty-one million, one hundred sixty-five thousand, five hundred sixty-six".