20611001 has 12 divisors (see below), whose sum is σ = 21755904. Its totient is φ = 19505400.

The previous prime is 20610983. The next prime is 20611007. The reversal of 20611001 is 10011602.

It is not a de Polignac number, because 20611001 - 2¹⁰ = 20609977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20611007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107816 + ... + 108006.

It is an arithmetic number, because the mean of its divisors is an integer number (1812992).

Almost surely, 2^20611001 is an apocalyptic number.

It is an amenable number.

20611001 is a deficient number, since it is larger than the sum of its proper divisors (1144903).

20611001 is an equidigital number, since it uses as much as digits as its factorization.

20611001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 20611001 is about 4539.9340303577. The cubic root of 20611001 is about 274.1782676741.

Adding to 20611001 its reverse (10011602), we get a palindrome (30622603).

The spelling of 20611001 in words is "twenty million, six hundred eleven thousand, one".