20026665 has 48 divisors (see below), whose sum is σ = 37252800. Its totient is φ = 9922176.

The previous prime is 20026639. The next prime is 20026673. The reversal of 20026665 is 56662002.

20026665 = T₂₁₁ + T₂₁₂ + ... + T₅₀₅.

It is not a de Polignac number, because 20026665 - 2¹⁴ = 20010281 is a prime.

It is a super-2 number, since 2×20026665² = 802134622044450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50247 + ... + 50643.

It is an arithmetic number, because the mean of its divisors is an integer number (776100).

Almost surely, 2^20026665 is an apocalyptic number.

It is an amenable number.

20026665 is a deficient number, since it is larger than the sum of its proper divisors (17226135).

20026665 is a wasteful number, since it uses less digits than its factorization.

20026665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20026665 is about 4475.1161996087. The cubic root of 20026665 is about 271.5623413307.

Adding to 20026665 its reverse (56662002), we get a palindrome (76688667).

The spelling of 20026665 in words is "twenty million, twenty-six thousand, six hundred sixty-five".