20003405820 has 48 divisors (see below), whose sum is σ = 56036056608. Its totient is φ = 5331715840.

The previous prime is 20003405809. The next prime is 20003405833. The reversal of 20003405820 is 2850430002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50602 + ... + 206318.

It is an arithmetic number, because the mean of its divisors is an integer number (1167417846).

Almost surely, 2^20003405820 is an apocalyptic number.

20003405820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20003405820 is an abundant number, since it is smaller than the sum of its proper divisors (36032650788).

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

20003405820 is a wasteful number, since it uses less digits than its factorization.

20003405820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157870 (or 157868 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 20003405820 its reverse (2850430002), we get a palindrome (22853835822).

The spelling of 20003405820 in words is "twenty billion, three million, four hundred five thousand, eight hundred twenty".