20402220111 has 24 divisors (see below), whose sum is σ = 34078436784. Its totient is φ = 10761609600.

The previous prime is 20402220089. The next prime is 20402220131. The reversal of 20402220111 is 11102220402.

It is not a de Polignac number, because 20402220111 - 2⁹ = 20402219599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402220131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5336190 + ... + 5340011.

It is an arithmetic number, because the mean of its divisors is an integer number (1419934866).

Almost surely, 2^20402220111 is an apocalyptic number.

20402220111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20402220111 is a deficient number, since it is larger than the sum of its proper divisors (13676216673).

20402220111 is a wasteful number, since it uses less digits than its factorization.

20402220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676231 (or 10676224 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20402220111 its reverse (11102220402), we get a palindrome (31504440513).

The spelling of 20402220111 in words is "twenty billion, four hundred two million, two hundred twenty thousand, one hundred eleven".