1000001020 has 24 divisors (see below), whose sum is σ = 2100599424. Its totient is φ = 399886656.

The previous prime is 1000001011. The next prime is 1000001021. The reversal of 1000001020 is 201000001.

It is a Harshad number since it is a multiple of its sum of digits (4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000001021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123414 + ... + 131266.

It is an arithmetic number, because the mean of its divisors is an integer number (87524976).

Almost surely, 2^1000001020 is an apocalyptic number.

1000001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000001020 is an abundant number, since it is smaller than the sum of its proper divisors (1100598404).

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

1000001020 is a wasteful number, since it uses less digits than its factorization.

1000001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14229 (or 14227 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 1000001020 is about 31622.7927292957. The cubic root of 1000001020 is about 1000.0003399999. Note that the first 3 decimals are identical.

Adding to 1000001020 its reverse (201000001), we get a palindrome (1201001021).

The spelling of 1000001020 in words is "one billion, one thousand, twenty".