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1001020 = 22550051

1001020 has 12 divisors (see below), whose sum is σ = 2102184. Its totient is φ = 400400.

The previous prime is 1001017. The next prime is 1001023. The reversal of 1001020 is 201001.

Adding to 1001020 its reverse (201001), we get a palindrome (1202021).

It is an interprime number because it is at equal distance from previous prime (1001017) and next prime (1001023).

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 (1001023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25006 + ... + 25045.

It is an arithmetic number, because the mean of its divisors is an integer number (175182).

21001020 is an apocalyptic number.

1001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001020 is an abundant number, since it is smaller than the sum of its proper divisors (1101164).

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

1001020 is a wasteful number, since it uses less digits than its factorization.

1001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50060 (or 50058 counting only the distinct ones).

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

The square root of 1001020 is about 1000.5098700163. The cubic root of 1001020 is about 100.0339884465.

The spelling of 1001020 in words is "one million, one thousand, twenty".

Divisors: 1 2 4 5 10 20 50051 100102 200204 250255 500510 1001020