20020001 has 2 divisors, whose sum is σ = 20020002. Its totient is φ = 20020000.

The previous prime is 20019973. The next prime is 20020019. The reversal of 20020001 is 10002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17648401 + 2371600 = 4201^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020001 - 2²² = 15825697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20020501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010000 + 10010001.

It is an arithmetic number, because the mean of its divisors is an integer number (10010001).

Almost surely, 2^20020001 is an apocalyptic number.

It is an amenable number.

20020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020001 is an equidigital number, since it uses as much as digits as its factorization.

20020001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 20020001 is about 4474.3715759870. The cubic root of 20020001 is about 271.5322166243.

Adding to 20020001 its reverse (10002002), we get a palindrome (30022003).

Multiplying 20020001 by its reverse (10002002), we get a palindrome (200240090042002).

The spelling of 20020001 in words is "twenty million, twenty thousand, one".