20344145256566 has 8 divisors (see below), whose sum is σ = 30525547218384. Its totient is φ = 10168962850440.

The previous prime is 20344145256473. The next prime is 20344145256571. The reversal of 20344145256566 is 66565254144302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20344145256566² (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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1554880745 + ... + 1554893828.

It is an arithmetic number, because the mean of its divisors is an integer number (3815693402298).

Almost surely, 2^{20344145256566} is an apocalyptic number.

20344145256566 is a deficient number, since it is larger than the sum of its proper divisors (10181401961818).

20344145256566 is a wasteful number, since it uses less digits than its factorization.

20344145256566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109777846.

The product of its (nonzero) digits is 20736000, while the sum is 53.

The spelling of 20344145256566 in words is "twenty trillion, three hundred forty-four billion, one hundred forty-five million, two hundred fifty-six thousand, five hundred sixty-six".