20560913 has 4 divisors (see below), whose sum is σ = 21269940. Its totient is φ = 19851888.

The previous prime is 20560909. The next prime is 20560921. The reversal of 20560913 is 31906502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4464769 + 16096144 = 2113^2 + 4012^2 .

It is a cyclic number.

It is not a de Polignac number, because 20560913 - 2² = 20560909 is a prime.

It is a super-2 number, since 2×20560913² = 845502286787138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20560933) 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, 354470 + ... + 354527.

It is an arithmetic number, because the mean of its divisors is an integer number (5317485).

Almost surely, 2^20560913 is an apocalyptic number.

It is an amenable number.

20560913 is a deficient number, since it is larger than the sum of its proper divisors (709027).

20560913 is an equidigital number, since it uses as much as digits as its factorization.

20560913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709026.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20560913 is about 4534.4142951433. The cubic root of 20560913 is about 273.9559886332.

The spelling of 20560913 in words is "twenty million, five hundred sixty thousand, nine hundred thirteen".