20005216470634 has 4 divisors (see below), whose sum is σ = 30007824705954. Its totient is φ = 10002608235316.

The previous prime is 20005216470623. The next prime is 20005216470661. The reversal of 20005216470634 is 43607461250002.

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., 18082931274409 + 1922285196225 = 4252403^2 + 1386465^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001304117657 + ... + 5001304117660.

Almost surely, 2^{20005216470634} is an apocalyptic number.

20005216470634 is a deficient number, since it is larger than the sum of its proper divisors (10002608235320).

20005216470634 is a wasteful number, since it uses less digits than its factorization.

20005216470634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002608235319.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 20005216470634 in words is "twenty trillion, five billion, two hundred sixteen million, four hundred seventy thousand, six hundred thirty-four".