20420031 has 8 divisors (see below), whose sum is σ = 28165680. Its totient is φ = 13143872.

The previous prime is 20420027. The next prime is 20420033. The reversal of 20420031 is 13002402.

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

It is a cyclic number.

It is not a de Polignac number, because 20420031 - 2² = 20420027 is a prime.

It is a super-2 number, since 2×20420031² = 833955332081922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20419989 and 20420016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420033) 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 7 ways as a sum of consecutive naturals, for example, 117270 + ... + 117443.

It is an arithmetic number, because the mean of its divisors is an integer number (3520710).

Almost surely, 2^20420031 is an apocalyptic number.

20420031 is a deficient number, since it is larger than the sum of its proper divisors (7745649).

20420031 is a wasteful number, since it uses less digits than its factorization.

20420031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234745.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20420031 is about 4518.8528411534. The cubic root of 20420031 is about 273.3288446946.

Adding to 20420031 its reverse (13002402), we get a palindrome (33422433).

The spelling of 20420031 in words is "twenty million, four hundred twenty thousand, thirty-one".