1015720020 has 288 divisors, whose sum is σ = 3838060800. Its totient is φ = 221937408.

The previous prime is 1015720003. The next prime is 1015720033. The reversal of 1015720020 is 200275101.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1015719975 and 1015720002.

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 95 ways as a sum of consecutive naturals, for example, 607746 + ... + 609414.

It is an arithmetic number, because the mean of its divisors is an integer number (13326600).

Almost surely, 2^1015720020 is an apocalyptic number.

1015720020 is a gapful number since it is divisible by the number (10) 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 1015720020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1919030400).

1015720020 is an abundant number, since it is smaller than the sum of its proper divisors (2822340780).

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

1015720020 is a wasteful number, since it uses less digits than its factorization.

1015720020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1015720020 is about 31870.3627215004. The cubic root of 1015720020 is about 1005.2127863096.

Adding to 1015720020 its reverse (200275101), we get a palindrome (1215995121).

The spelling of 1015720020 in words is "one billion, fifteen million, seven hundred twenty thousand, twenty".