1020005136 has 140 divisors (see below), whose sum is σ = 2987260812. Its totient is φ = 337229568.

The previous prime is 1020005111. The next prime is 1020005137. The reversal of 1020005136 is 6315000201.

It can be written as a sum of positive squares in 2 ways, for example, as 182250000 + 837755136 = 13500^2 + 28944^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1020005137) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1830970 + ... + 1831526.

Almost surely, 2^1020005136 is an apocalyptic number.

1020005136 is a gapful number since it is divisible by the number (16) 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 1020005136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493630406).

1020005136 is an abundant number, since it is smaller than the sum of its proper divisors (1967255676).

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

1020005136 is an equidigital number, since it uses as much as digits as its factorization.

1020005136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1020005136 is about 31937.5192524404. The cubic root of 1020005136 is about 1006.6243991044.

Adding to 1020005136 its reverse (6315000201), we get a palindrome (7335005337).

The spelling of 1020005136 in words is "one billion, twenty million, five thousand, one hundred thirty-six".