20601001 has 4 divisors (see below), whose sum is σ = 20623572. Its totient is φ = 20578432.

The previous prime is 20600977. The next prime is 20601023. The reversal of 20601001 is 10010602.

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 5978025 + 14622976 = 2445^2 + 3824^2 .

It is a cyclic number.

It is not a de Polignac number, because 20601001 - 2⁵ = 20600969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20601401) 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, 9856 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (5155893).

Almost surely, 2^20601001 is an apocalyptic number.

It is an amenable number.

20601001 is a deficient number, since it is larger than the sum of its proper divisors (22571).

20601001 is an equidigital number, since it uses as much as digits as its factorization.

20601001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22570.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20601001 is about 4538.8325591500. The cubic root of 20601001 is about 274.1339187652.

Adding to 20601001 its reverse (10010602), we get a palindrome (30611603).

The spelling of 20601001 in words is "twenty million, six hundred one thousand, one".