20638914720771 has 8 divisors (see below), whose sum is σ = 27606471661840. Its totient is φ = 13715317130112.

The previous prime is 20638914720763. The next prime is 20638914720839. The reversal of 20638914720771 is 17702741983602.

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

It is not a de Polignac number, because 20638914720771 - 2³ = 20638914720763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20638914720701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10989836506 + ... + 10989838383.

It is an arithmetic number, because the mean of its divisors is an integer number (3450808957730).

Almost surely, 2^{20638914720771} is an apocalyptic number.

20638914720771 is a deficient number, since it is larger than the sum of its proper divisors (6967556941069).

20638914720771 is a wasteful number, since it uses less digits than its factorization.

20638914720771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21979675205.

The product of its (nonzero) digits is 7112448, while the sum is 57.

The spelling of 20638914720771 in words is "twenty trillion, six hundred thirty-eight billion, nine hundred fourteen million, seven hundred twenty thousand, seven hundred seventy-one".