20265563 has 4 divisors (see below), whose sum is σ = 20367600. Its totient is φ = 20163528.

The previous prime is 20265551. The next prime is 20265589. The reversal of 20265563 is 36556202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20265563 - 2⁶ = 20265499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20265503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50720 + ... + 51117.

It is an arithmetic number, because the mean of its divisors is an integer number (5091900).

Almost surely, 2^20265563 is an apocalyptic number.

20265563 is a deficient number, since it is larger than the sum of its proper divisors (102037).

20265563 is a wasteful number, since it uses less digits than its factorization.

20265563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102036.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 20265563 is about 4501.7288901043. The cubic root of 20265563 is about 272.6378978288.

The spelling of 20265563 in words is "twenty million, two hundred sixty-five thousand, five hundred sixty-three".