20078665 has 8 divisors (see below), whose sum is σ = 24148800. Its totient is φ = 16026672.

The previous prime is 20078659. The next prime is 20078671. The reversal of 20078665 is 56687002.

It is an interprime number because it is at equal distance from previous prime (20078659) and next prime (20078671).

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 20078665 - 2⁵ = 20078633 is a prime.

It is a super-3 number, since 3×20078665³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20078665.

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, 1965 + ... + 6634.

It is an arithmetic number, because the mean of its divisors is an integer number (3018600).

Almost surely, 2^20078665 is an apocalyptic number.

It is an amenable number.

20078665 is a deficient number, since it is larger than the sum of its proper divisors (4070135).

20078665 is an equidigital number, since it uses as much as digits as its factorization.

20078665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9071.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 20078665 is about 4480.9223380907. The cubic root of 20078665 is about 271.7971788541.

The spelling of 20078665 in words is "twenty million, seventy-eight thousand, six hundred sixty-five".