20012665 has 8 divisors (see below), whose sum is σ = 24117120. Its totient is φ = 15942192.

The previous prime is 20012609. The next prime is 20012683. The reversal of 20012665 is 56621002.

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 20012665 - 2²³ = 11624057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7179 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (3014640).

Almost surely, 2^20012665 is an apocalyptic number.

It is an amenable number.

20012665 is a deficient number, since it is larger than the sum of its proper divisors (4104455).

20012665 is a wasteful number, since it uses less digits than its factorization.

20012665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16991.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20012665 is about 4473.5517209484. The cubic root of 20012665 is about 271.4990464012.

Adding to 20012665 its reverse (56621002), we get a palindrome (76633667).

The spelling of 20012665 in words is "twenty million, twelve thousand, six hundred sixty-five".