20465566 has 16 divisors (see below), whose sum is σ = 34058880. Its totient is φ = 9144280.

The previous prime is 20465563. The next prime is 20465587. The reversal of 20465566 is 66556402.

20465566 = 1359² + 1360² + ... + 1369².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6586 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (2128680).

Almost surely, 2^20465566 is an apocalyptic number.

20465566 is a deficient number, since it is larger than the sum of its proper divisors (13593314).

20465566 is a wasteful number, since it uses less digits than its factorization.

20465566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15839.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 20465566 is about 4523.8883717439. Note that the first 3 decimals coincide. The cubic root of 20465566 is about 273.5318608601.

The spelling of 20465566 in words is "twenty million, four hundred sixty-five thousand, five hundred sixty-six".