20005213298666 has 4 divisors (see below), whose sum is σ = 30007819948002. Its totient is φ = 10002606649332.

The previous prime is 20005213298621. The next prime is 20005213298689. The reversal of 20005213298666 is 66689231250002.

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

It can be written as a sum of positive squares in only one way, i.e., 19623881113225 + 381332185441 = 4429885^2 + 617521^2 .

It is a super-3 number, since 3×20005213298666³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001303324665 + ... + 5001303324668.

Almost surely, 2^{20005213298666} is an apocalyptic number.

20005213298666 is a deficient number, since it is larger than the sum of its proper divisors (10002606649336).

20005213298666 is a wasteful number, since it uses less digits than its factorization.

20005213298666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002606649335.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 20005213298666 in words is "twenty trillion, five billion, two hundred thirteen million, two hundred ninety-eight thousand, six hundred sixty-six".