20662509 has 8 divisors (see below), whose sum is σ = 31485760. Its totient is φ = 11807136.

The previous prime is 20662501. The next prime is 20662517. The reversal of 20662509 is 90526602.

It is an interprime number because it is at equal distance from previous prime (20662501) and next prime (20662517).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20662509 - 2³ = 20662501 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 (20662501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491944 + ... + 491985.

It is an arithmetic number, because the mean of its divisors is an integer number (3935720).

Almost surely, 2^20662509 is an apocalyptic number.

It is an amenable number.

20662509 is a deficient number, since it is larger than the sum of its proper divisors (10823251).

20662509 is an equidigital number, since it uses as much as digits as its factorization.

20662509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983939.

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

The square root of 20662509 is about 4545.6032602945. The cubic root of 20662509 is about 274.4064730926.

The spelling of 20662509 in words is "twenty million, six hundred sixty-two thousand, five hundred nine".