201111020 has 48 divisors (see below), whose sum is σ = 487837728. Its totient is φ = 68828160.

The previous prime is 201111017. The next prime is 201111023. The reversal of 201111020 is 20111102.

It is an interprime number because it is at equal distance from previous prime (201111017) and next prime (201111023).

It is a junction number, because it is equal to n+sod(n) for n = 201110989 and 201111007.

It is not an unprimeable number, because it can be changed into a prime (201111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23147 + ... + 30626.

It is an arithmetic number, because the mean of its divisors is an integer number (10163286).

Almost surely, 2^201111020 is an apocalyptic number.

201111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201111020 is an abundant number, since it is smaller than the sum of its proper divisors (286726708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201111020 is a wasteful number, since it uses less digits than its factorization.

201111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53810 (or 53808 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 201111020 is about 14181.3617117680. The cubic root of 201111020 is about 585.8844293670.

Adding to 201111020 its reverse (20111102), we get a palindrome (221222122).

It can be divided in two parts, 2011 and 11020, that added together give a palindrome (13031).

The spelling of 201111020 in words is "two hundred one million, one hundred eleven thousand, twenty".