20205001 has 2 divisors, whose sum is σ = 20205002. Its totient is φ = 20205000.

The previous prime is 20204981. The next prime is 20205023. The reversal of 20205001 is 10050202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 491401 = 4440^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205001 - 2¹³ = 20196809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20205041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102500 + 10102501.

It is an arithmetic number, because the mean of its divisors is an integer number (10102501).

Almost surely, 2^20205001 is an apocalyptic number.

It is an amenable number.

20205001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205001 is an equidigital number, since it uses as much as digits as its factorization.

20205001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20205001 is about 4494.9973303663. The cubic root of 20205001 is about 272.3660413879.

Adding to 20205001 its reverse (10050202), we get a palindrome (30255203).

It can be divided in two parts, 2020 and 5001, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 20205001 in words is "twenty million, two hundred five thousand, one".