20506001 has 2 divisors, whose sum is σ = 20506002. Its totient is φ = 20506000.

The previous prime is 20505983. The next prime is 20506009. The reversal of 20506001 is 10060502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 1809025 = 4324^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 20506001 - 2¹⁴ = 20489617 is a prime.

It is not a weakly prime, because it can be changed into another prime (20506009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253000 + 10253001.

It is an arithmetic number, because the mean of its divisors is an integer number (10253001).

Almost surely, 2^20506001 is an apocalyptic number.

It is an amenable number.

20506001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506001 is an equidigital number, since it uses as much as digits as its factorization.

20506001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20506001 is about 4528.3552201655. The cubic root of 20506001 is about 273.7118865782.

Adding to 20506001 its reverse (10060502), we get a palindrome (30566503).

The spelling of 20506001 in words is "twenty million, five hundred six thousand, one".