20493611 has 4 divisors (see below), whose sum is σ = 20566824. Its totient is φ = 20420400.

The previous prime is 20493593. The next prime is 20493637. The reversal of 20493611 is 11639402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20493611 - 2¹⁴ = 20477227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20493911) 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 3 ways as a sum of consecutive naturals, for example, 36185 + ... + 36746.

It is an arithmetic number, because the mean of its divisors is an integer number (5141706).

Almost surely, 2^20493611 is an apocalyptic number.

20493611 is a deficient number, since it is larger than the sum of its proper divisors (73213).

20493611 is an equidigital number, since it uses as much as digits as its factorization.

20493611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73212.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20493611 is about 4526.9869670676. The cubic root of 20493611 is about 273.6567486778.

The spelling of 20493611 in words is "twenty million, four hundred ninety-three thousand, six hundred eleven".