20612665 has 8 divisors (see below), whose sum is σ = 24763968. Its totient is φ = 16470960.

The previous prime is 20612659. The next prime is 20612681. The reversal of 20612665 is 56621602.

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

It is not a de Polignac number, because 20612665 - 2¹¹ = 20610617 is a prime.

It is a Duffinian number.

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, 3780 + ... + 7450.

It is an arithmetic number, because the mean of its divisors is an integer number (3095496).

Almost surely, 2^20612665 is an apocalyptic number.

It is an amenable number.

20612665 is a deficient number, since it is larger than the sum of its proper divisors (4151303).

20612665 is a wasteful number, since it uses less digits than its factorization.

20612665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20612665 is about 4540.1172892338. The cubic root of 20612665 is about 274.1856459403.

The spelling of 20612665 in words is "twenty million, six hundred twelve thousand, six hundred sixty-five".