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1331020 = 225611091
BaseRepresentation
bin101000100111101001100
32111121211001
411010331030
5320043040
644310044
714212345
oct5047514
92447731
101331020
1182a019
12542324
13377ab2
142690cc
151b459a
hex144f4c

1331020 has 24 divisors (see below), whose sum is σ = 2843568. Its totient is φ = 523200.

The previous prime is 1330997. The next prime is 1331023. The reversal of 1331020 is 201331.

It is a super-2 number, since 2×13310202 = 3543228480800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1330988 and 1331006.

It is not an unprimeable number, because it can be changed into a prime (1331023) 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, 675 + ... + 1765.

It is an arithmetic number, because the mean of its divisors is an integer number (118482).

21331020 is an apocalyptic number.

1331020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331020 is an abundant number, since it is smaller than the sum of its proper divisors (1512548).

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

1331020 is a wasteful number, since it uses less digits than its factorization.

1331020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 1331020 is about 1153.6984007963. The cubic root of 1331020 is about 110.0005509614. Note that the first 3 decimals are identical.

Adding to 1331020 its reverse (201331), we get a palindrome (1532351).

The spelling of 1331020 in words is "one million, three hundred thirty-one thousand, twenty".

Divisors: 1 2 4 5 10 20 61 122 244 305 610 1091 1220 2182 4364 5455 10910 21820 66551 133102 266204 332755 665510 1331020