20420313 has 16 divisors (see below), whose sum is σ = 28343040. Its totient is φ = 13066704.

The previous prime is 20420311. The next prime is 20420329. The reversal of 20420313 is 31302402.

It is not a de Polignac number, because 20420313 - 2¹ = 20420311 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20420292 and 20420301.

It is not an unprimeable number, because it can be changed into a prime (20420311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6270 + ... + 8952.

It is an arithmetic number, because the mean of its divisors is an integer number (1771440).

Almost surely, 2^20420313 is an apocalyptic number.

It is an amenable number.

20420313 is a deficient number, since it is larger than the sum of its proper divisors (7922727).

20420313 is a wasteful number, since it uses less digits than its factorization.

20420313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20420313 is about 4518.8840436550. The cubic root of 20420313 is about 273.3301029098.

Adding to 20420313 its reverse (31302402), we get a palindrome (51722715).

The spelling of 20420313 in words is "twenty million, four hundred twenty thousand, three hundred thirteen".