20563466 has 48 divisors (see below), whose sum is σ = 39580800. Its totient is φ = 7840800.

The previous prime is 20563457. The next prime is 20563471. The reversal of 20563466 is 66436502.

It is a super-2 number, since 2×20563466² = 845712267866312, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 103235 + ... + 103433.

It is an arithmetic number, because the mean of its divisors is an integer number (824600).

Almost surely, 2^20563466 is an apocalyptic number.

20563466 is a deficient number, since it is larger than the sum of its proper divisors (19017334).

20563466 is a wasteful number, since it uses less digits than its factorization.

20563466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 20563466 is about 4534.6958001612. The cubic root of 20563466 is about 273.9673269866.

Adding to 20563466 its reverse (66436502), we get a palindrome (86999968).

The spelling of 20563466 in words is "twenty million, five hundred sixty-three thousand, four hundred sixty-six".