20420312 has 16 divisors (see below), whose sum is σ = 41769000. Its totient is φ = 9281920.

The previous prime is 20420311. The next prime is 20420329. The reversal of 20420312 is 21302402.

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 3 ways as a sum of consecutive naturals, for example, 115937 + ... + 116112.

Almost surely, 2^20420312 is an apocalyptic number.

20420312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20420312 is an abundant number, since it is smaller than the sum of its proper divisors (21348688).

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

20420312 is a wasteful number, since it uses less digits than its factorization.

20420312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232066 (or 232062 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20420312 is about 4518.8839330082. The cubic root of 20420312 is about 273.3300984481.

Adding to 20420312 its reverse (21302402), we get a palindrome (41722714).

The spelling of 20420312 in words is "twenty million, four hundred twenty thousand, three hundred twelve".