20563407 has 12 divisors (see below), whose sum is σ = 30727320. Its totient is φ = 13236048.

The previous prime is 20563399. The next prime is 20563457. The reversal of 20563407 is 70436502.

It is a happy number.

20563407 is a `hidden beast` number, since 20 + 5 + 634 + 0 + 7 = 666.

It is not a de Polignac number, because 20563407 - 2³ = 20563399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39133 + ... + 39654.

It is an arithmetic number, because the mean of its divisors is an integer number (2560610).

Almost surely, 2^20563407 is an apocalyptic number.

20563407 is a deficient number, since it is larger than the sum of its proper divisors (10163913).

20563407 is a wasteful number, since it uses less digits than its factorization.

20563407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78822 (or 78819 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20563407 is about 4534.6892947588. The cubic root of 20563407 is about 273.9670649671.

Adding to 20563407 its reverse (70436502), we get a palindrome (90999909).

The spelling of 20563407 in words is "twenty million, five hundred sixty-three thousand, four hundred seven".