20020420 has 72 divisors (see below), whose sum is σ = 50561280. Its totient is φ = 6632640.

The previous prime is 20020387. The next prime is 20020421. The reversal of 20020420 is 2402002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20020397 and 20020406.

It is not an unprimeable number, because it can be changed into a prime (20020421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30051 + ... + 30709.

It is an arithmetic number, because the mean of its divisors is an integer number (702240).

Almost surely, 2^20020420 is an apocalyptic number.

20020420 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 20020420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25280640).

20020420 is an abundant number, since it is smaller than the sum of its proper divisors (30540860).

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

20020420 is a wasteful number, since it uses less digits than its factorization.

20020420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20020420 is about 4474.4183979597. The cubic root of 20020420 is about 271.5341109166.

Adding to 20020420 its reverse (2402002), we get a palindrome (22422422).

The spelling of 20020420 in words is "twenty million, twenty thousand, four hundred twenty".