20420344 has 32 divisors (see below), whose sum is σ = 43924320. Its totient is φ = 8718336.

The previous prime is 20420329. The next prime is 20420347. The reversal of 20420344 is 44302402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19252 + ... + 20284.

It is an arithmetic number, because the mean of its divisors is an integer number (1372635).

Almost surely, 2^20420344 is an apocalyptic number.

It is an amenable number.

20420344 is an abundant number, since it is smaller than the sum of its proper divisors (23503976).

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

20420344 is a wasteful number, since it uses less digits than its factorization.

20420344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1395 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20420344 is about 4518.8874737041. The cubic root of 20420344 is about 273.3302412235.

Adding to 20420344 its reverse (44302402), we get a palindrome (64722746).

The spelling of 20420344 in words is "twenty million, four hundred twenty thousand, three hundred forty-four".