501100020 has 84 divisors (see below), whose sum is σ = 1577789220. Its totient is φ = 133622784.

The previous prime is 501100009. The next prime is 501100031. The reversal of 501100020 is 20001105.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (501100009) and next prime (501100031).

It can be written as a sum of positive squares in 2 ways, for example, as 373726224 + 127373796 = 19332^2 + 11286^2 .

It is a super-2 number, since 2×501100020² = 502202460088000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 501099975 and 501100011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2605 + ... + 31764.

It is an arithmetic number, because the mean of its divisors is an integer number (18783205).

Almost surely, 2^501100020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 501100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788894610).

501100020 is an abundant number, since it is smaller than the sum of its proper divisors (1076689200).

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

501100020 is a wasteful number, since it uses less digits than its factorization.

501100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34396 (or 34379 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 501100020 is about 22385.2634561222. The cubic root of 501100020 is about 794.2821572901.

Adding to 501100020 its reverse (20001105), we get a palindrome (521101125).

The spelling of 501100020 in words is "five hundred one million, one hundred thousand, twenty".