20503420 has 48 divisors (see below), whose sum is σ = 49613760. Its totient is φ = 6971904.

The previous prime is 20503409. The next prime is 20503429. The reversal of 20503420 is 2430502.

It is a junction number, because it is equal to n+sod(n) for n = 20503394 and 20503403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503429) 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, 18646 + ... + 19714.

It is an arithmetic number, because the mean of its divisors is an integer number (1033620).

Almost surely, 2^20503420 is an apocalyptic number.

20503420 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 20503420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24806880).

20503420 is an abundant number, since it is smaller than the sum of its proper divisors (29110340).

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

20503420 is a wasteful number, since it uses less digits than its factorization.

20503420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20503420 is about 4528.0702291374. The cubic root of 20503420 is about 273.7004024600.

Adding to 20503420 its reverse (2430502), we get a palindrome (22933922).

The spelling of 20503420 in words is "twenty million, five hundred three thousand, four hundred twenty".