20678241566 has 4 divisors (see below), whose sum is σ = 31017362352. Its totient is φ = 10339120782.

The previous prime is 20678241527. The next prime is 20678241593. The reversal of 20678241566 is 66514287602.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20678241566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5169560390 + ... + 5169560393.

It is an arithmetic number, because the mean of its divisors is an integer number (7754340588).

Almost surely, 2^20678241566 is an apocalyptic number.

20678241566 is a deficient number, since it is larger than the sum of its proper divisors (10339120786).

20678241566 is a wasteful number, since it uses less digits than its factorization.

20678241566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10339120785.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 20678241566 in words is "twenty billion, six hundred seventy-eight million, two hundred forty-one thousand, five hundred sixty-six".