20825648438566 has 4 divisors (see below), whose sum is σ = 31238472657852. Its totient is φ = 10412824219282.

The previous prime is 20825648438527. The next prime is 20825648438591. The reversal of 20825648438566 is 66583484652802.

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

It is a super-2 number, since 2×20825648438566² (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 as a sum of consecutive naturals, namely, 5206412109640 + ... + 5206412109643.

It is an arithmetic number, because the mean of its divisors is an integer number (7809618164463).

Almost surely, 2^{20825648438566} is an apocalyptic number.

20825648438566 is a deficient number, since it is larger than the sum of its proper divisors (10412824219286).

20825648438566 is a wasteful number, since it uses less digits than its factorization.

20825648438566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10412824219285.

The product of its (nonzero) digits is 530841600, while the sum is 67.

The spelling of 20825648438566 in words is "twenty trillion, eight hundred twenty-five billion, six hundred forty-eight million, four hundred thirty-eight thousand, five hundred sixty-six".