20009901101 has 4 divisors (see below), whose sum is σ = 20011377600. Its totient is φ = 20008424604.

The previous prime is 20009901071. The next prime is 20009901113. The reversal of 20009901101 is 10110990002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10110990002 = 2 ⋅5055495001.

It is a cyclic number.

It is not a de Polignac number, because 20009901101 - 2¹⁰ = 20009900077 is a prime.

It is a super-2 number, since 2×20009901101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009901151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717731 + ... + 745088.

It is an arithmetic number, because the mean of its divisors is an integer number (5002844400).

Almost surely, 2^20009901101 is an apocalyptic number.

It is an amenable number.

20009901101 is a deficient number, since it is larger than the sum of its proper divisors (1476499).

20009901101 is a wasteful number, since it uses less digits than its factorization.

20009901101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476498.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 20009901101 in words is "twenty billion, nine million, nine hundred one thousand, one hundred one".