20046665 has 4 divisors (see below), whose sum is σ = 24056004. Its totient is φ = 16037328.

The previous prime is 20046659. The next prime is 20046671. The reversal of 20046665 is 56664002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56664002 = 2 ⋅28332001.

It is an interprime number because it is at equal distance from previous prime (20046659) and next prime (20046671).

It can be written as a sum of positive squares in 2 ways, for example, as 7458361 + 12588304 = 2731^2 + 3548^2 .

It is a cyclic number.

It is not a de Polignac number, because 20046665 - 2¹⁸ = 19784521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004662 + ... + 2004671.

It is an arithmetic number, because the mean of its divisors is an integer number (6014001).

Almost surely, 2^20046665 is an apocalyptic number.

It is an amenable number.

20046665 is a deficient number, since it is larger than the sum of its proper divisors (4009339).

20046665 is an equidigital number, since it uses as much as digits as its factorization.

20046665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009338.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20046665 is about 4477.3502208337. The cubic root of 20046665 is about 271.6527115083.

The spelling of 20046665 in words is "twenty million, forty-six thousand, six hundred sixty-five".