20935031 has 4 divisors (see below), whose sum is σ = 22545432. Its totient is φ = 19324632.

The previous prime is 20935027. The next prime is 20935039. The reversal of 20935031 is 13053902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20935031 - 2² = 20935027 is a prime.

It is a super-2 number, since 2×20935031² = 876551045941922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20934988 and 20935006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20935039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805181 + ... + 805206.

It is an arithmetic number, because the mean of its divisors is an integer number (5636358).

Almost surely, 2^20935031 is an apocalyptic number.

20935031 is a deficient number, since it is larger than the sum of its proper divisors (1610401).

20935031 is a wasteful number, since it uses less digits than its factorization.

20935031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610400.

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

The square root of 20935031 is about 4575.4815047162. The cubic root of 20935031 is about 275.6076085749.

Adding to 20935031 its reverse (13053902), we get a palindrome (33988933).

The spelling of 20935031 in words is "twenty million, nine hundred thirty-five thousand, thirty-one".