20436020 has 48 divisors (see below), whose sum is σ = 49291200. Its totient is φ = 7038720.

The previous prime is 20436019. The next prime is 20436041. The reversal of 20436020 is 2063402.

It is a self number, because there is not a number n which added to its sum of digits gives 20436020.

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 15 ways as a sum of consecutive naturals, for example, 1736 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (1026900).

Almost surely, 2^20436020 is an apocalyptic number.

20436020 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 20436020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24645600).

20436020 is an abundant number, since it is smaller than the sum of its proper divisors (28855180).

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

20436020 is a wasteful number, since it uses less digits than its factorization.

20436020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20436020 is about 4520.6216386687. The cubic root of 20436020 is about 273.4001654278.

Adding to 20436020 its reverse (2063402), we get a palindrome (22499422).

The spelling of 20436020 in words is "twenty million, four hundred thirty-six thousand, twenty".