20563470 has 80 divisors (see below), whose sum is σ = 56453760. Its totient is φ = 5368896.

The previous prime is 20563457. The next prime is 20563471. The reversal of 20563470 is 7436502.

It is a happy number.

20563470 is a `hidden beast` number, since 20 + 5 + 634 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563471) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42691 + ... + 43169.

It is an arithmetic number, because the mean of its divisors is an integer number (705672).

Almost surely, 2^20563470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20563470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28226880).

20563470 is an abundant number, since it is smaller than the sum of its proper divisors (35890290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20563470 is a wasteful number, since it uses less digits than its factorization.

20563470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 542 counting only the distinct ones).

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

The square root of 20563470 is about 4534.6962412051. The cubic root of 20563470 is about 273.9673447506.

Adding to 20563470 its reverse (7436502), we get a palindrome (27999972).

The spelling of 20563470 in words is "twenty million, five hundred sixty-three thousand, four hundred seventy".