20010120111 has 12 divisors (see below), whose sum is σ = 28911058488. Its totient is φ = 13336594704.

The previous prime is 20010120041. The next prime is 20010120131. The reversal of 20010120111 is 11102101002.

It is a happy number.

It is not a de Polignac number, because 20010120111 - 2¹⁵ = 20010087343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20010120093 and 20010120102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010120131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253845 + ... + 323198.

It is an arithmetic number, because the mean of its divisors is an integer number (2409254874).

Almost surely, 2^20010120111 is an apocalyptic number.

20010120111 is a deficient number, since it is larger than the sum of its proper divisors (8900938377).

20010120111 is a wasteful number, since it uses less digits than its factorization.

20010120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580902 (or 580899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20010120111 its reverse (11102101002), we get a palindrome (31112221113).

The spelling of 20010120111 in words is "twenty billion, ten million, one hundred twenty thousand, one hundred eleven".