20465666 has 16 divisors (see below), whose sum is σ = 33179328. Its totient is φ = 9411600.

The previous prime is 20465663. The next prime is 20465689. The reversal of 20465666 is 66656402.

20465666 = T₁₉₆ + T₁₉₇ + ... + T₅₀₆.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20465663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6821 + ... + 9351.

It is an arithmetic number, because the mean of its divisors is an integer number (2073708).

Almost surely, 2^20465666 is an apocalyptic number.

20465666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20465666 is a deficient number, since it is larger than the sum of its proper divisors (12713662).

20465666 is a wasteful number, since it uses less digits than its factorization.

20465666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 20465666 is about 4523.8994241694. The cubic root of 20465666 is about 273.5323063750.

The spelling of 20465666 in words is "twenty million, four hundred sixty-five thousand, six hundred sixty-six".