20420310 has 32 divisors (see below), whose sum is σ = 49704192. Its totient is φ = 5368160.

The previous prime is 20420303. The next prime is 20420311. The reversal of 20420310 is 1302402.

It is a super-2 number, since 2×20420310² = 833978120992200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 2664 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (1553256).

Almost surely, 2^20420310 is an apocalyptic number.

20420310 is an abundant number, since it is smaller than the sum of its proper divisors (29283882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20420310 is a wasteful number, since it uses less digits than its factorization.

20420310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9668.

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

The square root of 20420310 is about 4518.8837117147. The cubic root of 20420310 is about 273.3300895246.

Adding to 20420310 its reverse (1302402), we get a palindrome (21722712).

The spelling of 20420310 in words is "twenty million, four hundred twenty thousand, three hundred ten".