20001013 has 4 divisors (see below), whose sum is σ = 20065228. Its totient is φ = 19936800.

The previous prime is 20001001. The next prime is 20001019. The reversal of 20001013 is 31010002.

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 8427409 + 11573604 = 2903^2 + 3402^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001013 - 2²¹ = 17903861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000987 and 20001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001019) 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, 31638 + ... + 32263.

It is an arithmetic number, because the mean of its divisors is an integer number (5016307).

Almost surely, 2^20001013 is an apocalyptic number.

It is an amenable number.

20001013 is a deficient number, since it is larger than the sum of its proper divisors (64215).

20001013 is an equidigital number, since it uses as much as digits as its factorization.

20001013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64214.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 20001013 is about 4472.2492104086. The cubic root of 20001013 is about 271.4463444239.

Adding to 20001013 its reverse (31010002), we get a palindrome (51011015).

The spelling of 20001013 in words is "twenty million, one thousand, thirteen".