20062561 has 4 divisors (see below), whose sum is σ = 20489472. Its totient is φ = 19635652.

The previous prime is 20062531. The next prime is 20062597. The reversal of 20062561 is 16526002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20062561 - 2⁷ = 20062433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20062531) 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, 213385 + ... + 213478.

It is an arithmetic number, because the mean of its divisors is an integer number (5122368).

Almost surely, 2^20062561 is an apocalyptic number.

It is an amenable number.

20062561 is a deficient number, since it is larger than the sum of its proper divisors (426911).

20062561 is an equidigital number, since it uses as much as digits as its factorization.

20062561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426910.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20062561 is about 4479.1250261630. The cubic root of 20062561 is about 271.7244948637.

Adding to 20062561 its reverse (16526002), we get a palindrome (36588563).

The spelling of 20062561 in words is "twenty million, sixty-two thousand, five hundred sixty-one".