20513013 has 8 divisors (see below), whose sum is σ = 27372576. Its totient is φ = 13664400.

The previous prime is 20513011. The next prime is 20513029. The reversal of 20513013 is 31031502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20513013 - 2¹ = 20513011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20512983 and 20513001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4023 + ... + 7563.

It is an arithmetic number, because the mean of its divisors is an integer number (3421572).

Almost surely, 2^20513013 is an apocalyptic number.

It is an amenable number.

20513013 is a deficient number, since it is larger than the sum of its proper divisors (6859563).

20513013 is a wasteful number, since it uses less digits than its factorization.

20513013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 20513013 is about 4529.1293865378. The cubic root of 20513013 is about 273.7430814957.

Adding to 20513013 its reverse (31031502), we get a palindrome (51544515).

The spelling of 20513013 in words is "twenty million, five hundred thirteen thousand, thirteen".