20493511 has 8 divisors (see below), whose sum is σ = 21454848. Its totient is φ = 19551000.

The previous prime is 20493503. The next prime is 20493521. The reversal of 20493511 is 11539402.

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 20493511 - 2³ = 20493503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20493521) 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 7 ways as a sum of consecutive naturals, for example, 2455 + ... + 6856.

It is an arithmetic number, because the mean of its divisors is an integer number (2681856).

Almost surely, 2^20493511 is an apocalyptic number.

20493511 is a deficient number, since it is larger than the sum of its proper divisors (961337).

20493511 is an equidigital number, since it uses as much as digits as its factorization.

20493511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9413.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20493511 is about 4526.9759221803. The cubic root of 20493511 is about 273.6563035680.

The spelling of 20493511 in words is "twenty million, four hundred ninety-three thousand, five hundred eleven".