20563413 has 12 divisors (see below), whose sum is σ = 29689920. Its totient is φ = 12654096.

The previous prime is 20563399. The next prime is 20563457. The reversal of 20563413 is 31436502.

It is a happy number.

It is not a de Polignac number, because 20563413 - 2⁵ = 20563381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563493) 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, 19773 + ... + 20786.

It is an arithmetic number, because the mean of its divisors is an integer number (2474160).

Almost surely, 2^20563413 is an apocalyptic number.

It is an amenable number.

20563413 is a deficient number, since it is larger than the sum of its proper divisors (9126507).

20563413 is a wasteful number, since it uses less digits than its factorization.

20563413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40588 (or 40575 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20563413 is about 4534.6899563256. The cubic root of 20563413 is about 273.9670916131.

Adding to 20563413 its reverse (31436502), we get a palindrome (51999915).

The spelling of 20563413 in words is "twenty million, five hundred sixty-three thousand, four hundred thirteen".