20563730 has 32 divisors (see below), whose sum is σ = 40963968. Its totient is φ = 7369600.

The previous prime is 20563729. The next prime is 20563733. The reversal of 20563730 is 3736502.

It is a self number, because there is not a number n which added to its sum of digits gives 20563730.

It is not an unprimeable number, because it can be changed into a prime (20563733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6494 + ... + 9126.

It is an arithmetic number, because the mean of its divisors is an integer number (1280124).

Almost surely, 2^20563730 is an apocalyptic number.

20563730 is a deficient number, since it is larger than the sum of its proper divisors (20400238).

20563730 is a wasteful number, since it uses less digits than its factorization.

20563730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 20563730 is about 4534.7249089664. The cubic root of 20563730 is about 273.9684994067.

The spelling of 20563730 in words is "twenty million, five hundred sixty-three thousand, seven hundred thirty".