20562001 has 4 divisors (see below), whose sum is σ = 20586852. Its totient is φ = 20537152.

The previous prime is 20561999. The next prime is 20562011. The reversal of 20562001 is 10026502.

It is a happy number.

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 7952400 + 12609601 = 2820^2 + 3551^2 .

It is a cyclic number.

It is not a de Polignac number, because 20562001 - 2¹ = 20561999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20562011) 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, 11140 + ... + 12853.

It is an arithmetic number, because the mean of its divisors is an integer number (5146713).

Almost surely, 2^20562001 is an apocalyptic number.

It is an amenable number.

20562001 is a deficient number, since it is larger than the sum of its proper divisors (24851).

20562001 is an equidigital number, since it uses as much as digits as its factorization.

20562001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24850.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20562001 is about 4534.5342649494. The cubic root of 20562001 is about 273.9608207606.

Adding to 20562001 its reverse (10026502), we get a palindrome (30588503).

The spelling of 20562001 in words is "twenty million, five hundred sixty-two thousand, one".