20700563 has 16 divisors (see below), whose sum is σ = 22952160. Its totient is φ = 18552576.

The previous prime is 20700553. The next prime is 20700593. The reversal of 20700563 is 36500702.

It is a cyclic number.

It is not a de Polignac number, because 20700563 - 2⁸ = 20700307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20700503) 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, 104981 + ... + 105177.

It is an arithmetic number, because the mean of its divisors is an integer number (1434510).

Almost surely, 2^20700563 is an apocalyptic number.

20700563 is a deficient number, since it is larger than the sum of its proper divisors (2251597).

20700563 is a wasteful number, since it uses less digits than its factorization.

20700563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20700563 is about 4549.7871378780. The cubic root of 20700563 is about 274.5748272842.

The spelling of 20700563 in words is "twenty million, seven hundred thousand, five hundred sixty-three".