20117978101 has 8 divisors (see below), whose sum is σ = 21667161824. Its totient is φ = 18569029680.

The previous prime is 20117978099. The next prime is 20117978119. The reversal of 20117978101 is 10187971102.

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

It is a cyclic number.

It is not a de Polignac number, because 20117978101 - 2¹ = 20117978099 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 (20117978131) 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, 144910 + ... + 247456.

It is an arithmetic number, because the mean of its divisors is an integer number (2708395228).

Almost surely, 2^20117978101 is an apocalyptic number.

It is an amenable number.

20117978101 is a deficient number, since it is larger than the sum of its proper divisors (1549183723).

20117978101 is a wasteful number, since it uses less digits than its factorization.

20117978101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117651.

The product of its (nonzero) digits is 7056, while the sum is 37.

The spelling of 20117978101 in words is "twenty billion, one hundred seventeen million, nine hundred seventy-eight thousand, one hundred one".