20351420 has 24 divisors (see below), whose sum is σ = 42853104. Its totient is φ = 8118656.

The previous prime is 20351381. The next prime is 20351437. The reversal of 20351420 is 2415302.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7712 + ... + 10008.

It is an arithmetic number, because the mean of its divisors is an integer number (1785546).

Almost surely, 2^20351420 is an apocalyptic number.

20351420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20351420 is an abundant number, since it is smaller than the sum of its proper divisors (22501684).

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

20351420 is a wasteful number, since it uses less digits than its factorization.

20351420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749 (or 2747 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20351420 is about 4511.2548143504. The cubic root of 20351420 is about 273.0223742435.

Adding to 20351420 its reverse (2415302), we get a palindrome (22766722).

The spelling of 20351420 in words is "twenty million, three hundred fifty-one thousand, four hundred twenty".