20935013 has 24 divisors (see below), whose sum is σ = 24750336. Its totient is φ = 17539200.

The previous prime is 20935009. The next prime is 20935027. The reversal of 20935013 is 31053902.

It is a happy number.

It is not a de Polignac number, because 20935013 - 2² = 20935009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20935013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20935043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286745 + ... + 286817.

It is an arithmetic number, because the mean of its divisors is an integer number (1031264).

Almost surely, 2^20935013 is an apocalyptic number.

It is an amenable number.

20935013 is a deficient number, since it is larger than the sum of its proper divisors (3815323).

20935013 is a wasteful number, since it uses less digits than its factorization.

20935013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 20935013 is about 4575.4795377097. The cubic root of 20935013 is about 275.6075295855.

Adding to 20935013 its reverse (31053902), we get a palindrome (51988915).

The spelling of 20935013 in words is "twenty million, nine hundred thirty-five thousand, thirteen".