1787420020 has 48 divisors (see below), whose sum is σ = 3809369088. Its totient is φ = 704416640.

The previous prime is 1787420009. The next prime is 1787420077. The reversal of 1787420020 is 200247871.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406554 + ... + 410926.

It is an arithmetic number, because the mean of its divisors is an integer number (79361856).

Almost surely, 2^1787420020 is an apocalyptic number.

1787420020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1787420020 is an abundant number, since it is smaller than the sum of its proper divisors (2021949068).

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

1787420020 is a wasteful number, since it uses less digits than its factorization.

1787420020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4680 (or 4678 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 1787420020 is about 42277.8904393301. The cubic root of 1787420020 is about 1213.5999204576.

Adding to 1787420020 its reverse (200247871), we get a palindrome (1987667891).

The spelling of 1787420020 in words is "one billion, seven hundred eighty-seven million, four hundred twenty thousand, twenty".