20343420 has 96 divisors (see below), whose sum is σ = 64088640. Its totient is φ = 5356800.

The previous prime is 20343419. The next prime is 20343473. The reversal of 20343420 is 2434302.

20343420 is a `hidden beast` number, since 203 + 43 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20343393 and 20343402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54354 + ... + 54726.

It is an arithmetic number, because the mean of its divisors is an integer number (667590).

Almost surely, 2^20343420 is an apocalyptic number.

20343420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20343420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32044320).

20343420 is an abundant number, since it is smaller than the sum of its proper divisors (43745220).

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

20343420 is a wasteful number, since it uses less digits than its factorization.

20343420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20343420 is about 4510.3680559351. The cubic root of 20343420 is about 272.9865951636.

Adding to 20343420 its reverse (2434302), we get a palindrome (22777722).

The spelling of 20343420 in words is "twenty million, three hundred forty-three thousand, four hundred twenty".