20110643 has 12 divisors (see below), whose sum is σ = 24417552. Its totient is φ = 16222080.

The previous prime is 20110631. The next prime is 20110687. The reversal of 20110643 is 34601102.

It is not a de Polignac number, because 20110643 - 2²² = 15916339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110603) 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, 2948 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (2034796).

Almost surely, 2^20110643 is an apocalyptic number.

20110643 is a deficient number, since it is larger than the sum of its proper divisors (4306909).

20110643 is an equidigital number, since it uses as much as digits as its factorization.

20110643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9982 (or 9965 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20110643 is about 4484.4891570836. The cubic root of 20110643 is about 271.9413936233.

Adding to 20110643 its reverse (34601102), we get a palindrome (54711745).

The spelling of 20110643 in words is "twenty million, one hundred ten thousand, six hundred forty-three".