20560420 has 24 divisors (see below), whose sum is σ = 44667000. Its totient is φ = 7940352.

The previous prime is 20560403. The next prime is 20560427. The reversal of 20560420 is 2406502.

It can be written as a sum of positive squares in 4 ways, for example, as 1340964 + 19219456 = 1158^2 + 4384^2 .

It is not an unprimeable number, because it can be changed into a prime (20560427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17145 + ... + 18304.

It is an arithmetic number, because the mean of its divisors is an integer number (1861125).

Almost surely, 2^20560420 is an apocalyptic number.

20560420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20560420 is an abundant number, since it is smaller than the sum of its proper divisors (24106580).

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

20560420 is a wasteful number, since it uses less digits than its factorization.

20560420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35487 (or 35485 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20560420 is about 4534.3599327799. The cubic root of 20560420 is about 273.9537990193.

Adding to 20560420 its reverse (2406502), we get a palindrome (22966922).

The spelling of 20560420 in words is "twenty million, five hundred sixty thousand, four hundred twenty".