20111623 has 8 divisors (see below), whose sum is σ = 23045792. Its totient is φ = 17192736.

The previous prime is 20111621. The next prime is 20111681. The reversal of 20111623 is 32611102.

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 20111623 - 2¹ = 20111621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111597 and 20111606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840 + ... + 6397.

It is an arithmetic number, because the mean of its divisors is an integer number (2880724).

Almost surely, 2^20111623 is an apocalyptic number.

20111623 is a deficient number, since it is larger than the sum of its proper divisors (2934169).

20111623 is an equidigital number, since it uses as much as digits as its factorization.

20111623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7641.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20111623 is about 4484.5984212636. The cubic root of 20111623 is about 271.9458108240.

Adding to 20111623 its reverse (32611102), we get a palindrome (52722725).

The spelling of 20111623 in words is "twenty million, one hundred eleven thousand, six hundred twenty-three".