20563460 has 24 divisors (see below), whose sum is σ = 44189376. Its totient is φ = 8033760.

The previous prime is 20563457. The next prime is 20563471. The reversal of 20563460 is 6436502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11096 + ... + 12815.

It is an arithmetic number, because the mean of its divisors is an integer number (1841224).

Almost surely, 2^20563460 is an apocalyptic number.

20563460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20563460 is an abundant number, since it is smaller than the sum of its proper divisors (23625916).

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

20563460 is a wasteful number, since it uses less digits than its factorization.

20563460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23963 (or 23961 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 20563460 is about 4534.6951385953. The cubic root of 20563460 is about 273.9673003405.

Adding to 20563460 its reverse (6436502), we get a palindrome (26999962).

The spelling of 20563460 in words is "twenty million, five hundred sixty-three thousand, four hundred sixty".