20100647671 has 16 divisors (see below), whose sum is σ = 21847924000. Its totient is φ = 18382785408.

The previous prime is 20100647579. The next prime is 20100647683. The reversal of 20100647671 is 17674600102.

It is a happy number.

It is not a de Polignac number, because 20100647671 - 2⁷ = 20100647543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100647971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698200 + ... + 726418.

It is an arithmetic number, because the mean of its divisors is an integer number (1365495250).

Almost surely, 2^20100647671 is an apocalyptic number.

20100647671 is a deficient number, since it is larger than the sum of its proper divisors (1747276329).

20100647671 is a wasteful number, since it uses less digits than its factorization.

20100647671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28738.

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 20100647671 in words is "twenty billion, one hundred million, six hundred forty-seven thousand, six hundred seventy-one".