1000020788 has 24 divisors (see below), whose sum is σ = 1886462760. Its totient is φ = 461105280.

The previous prime is 1000020779. The next prime is 1000020799. The reversal of 1000020788 is 8870200001.

It can be written as a sum of positive squares in 4 ways, for example, as 10163344 + 989857444 = 3188^2 + 31462^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 7 ways as a sum of consecutive naturals, for example, 48998 + ... + 66338.

It is an arithmetic number, because the mean of its divisors is an integer number (78602615).

Almost surely, 2^1000020788 is an apocalyptic number.

It is an amenable number.

1000020788 is a deficient number, since it is larger than the sum of its proper divisors (886441972).

1000020788 is a wasteful number, since it uses less digits than its factorization.

1000020788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18467 (or 18465 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 1000020788 is about 31623.1052871156. The cubic root of 1000020788 is about 1000.0069292853.

Adding to 1000020788 its reverse (8870200001), we get a palindrome (9870220789).

The spelling of 1000020788 in words is "one billion, twenty thousand, seven hundred eighty-eight".