20486521 has 4 divisors (see below), whose sum is σ = 22348944. Its totient is φ = 18624100.

The previous prime is 20486519. The next prime is 20486527. The reversal of 20486521 is 12568402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20486521 - 2¹ = 20486519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20486521.

It is not an unprimeable number, because it can be changed into a prime (20486527) 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, 931195 + ... + 931216.

It is an arithmetic number, because the mean of its divisors is an integer number (5587236).

Almost surely, 2^20486521 is an apocalyptic number.

It is an amenable number.

20486521 is a deficient number, since it is larger than the sum of its proper divisors (1862423).

20486521 is a wasteful number, since it uses less digits than its factorization.

20486521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862422.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20486521 is about 4526.2038177705. The cubic root of 20486521 is about 273.6251868064.

The spelling of 20486521 in words is "twenty million, four hundred eighty-six thousand, five hundred twenty-one".