20659413 has 4 divisors (see below), whose sum is σ = 27545888. Its totient is φ = 13772940.

The previous prime is 20659409. The next prime is 20659417. The reversal of 20659413 is 31495602.

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 an interprime number because it is at equal distance from previous prime (20659409) and next prime (20659417).

It is not a de Polignac number, because 20659413 - 2² = 20659409 is a prime.

It is a super-2 number, since 2×20659413² = 853622691009138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20659417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443233 + ... + 3443238.

It is an arithmetic number, because the mean of its divisors is an integer number (6886472).

Almost surely, 2^20659413 is an apocalyptic number.

It is an amenable number.

20659413 is a deficient number, since it is larger than the sum of its proper divisors (6886475).

20659413 is an equidigital number, since it uses as much as digits as its factorization.

20659413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6886474.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20659413 is about 4545.2626986787. The cubic root of 20659413 is about 274.3927670308.

The spelling of 20659413 in words is "twenty million, six hundred fifty-nine thousand, four hundred thirteen".