About the Number

21090820

21090819 ← → 21090821

2進数表記:1010000011101001000000100

漢数字表記:二千百九万八百二十

素因数分解:

2 2 × 5 1 × 53 1 × 101 1 × 197 1

素因数の和:360
約数の個数: 48
約数和(自身を含む): 45804528
約数和(自身を除く): 24713708

約数列:
[1, 2, 4, 5, 10, 20, 53, 101, 106, 197, 202, 212, 265, 394, 404, 505, 530, 788, 985, 1010, 1060, 1970, 2020, 3940, 5353, 10441, 10706, 19897, 20882, 21412, 26765, 39794, 41764, 52205, 53530, 79588, 99485, 104410, 107060, 198970, 208820, 397940, 1054541, 2109082, 4218164, 5272705, 10545410, 21090820]

約数ペア:
[(1, 21090820), (2, 10545410), (4, 5272705), (5, 4218164), (10, 2109082), (20, 1054541), (53, 397940), (101, 208820), (106, 198970), (197, 107060), (202, 104410), (212, 99485), (265, 79588), (394, 53530), (404, 52205), (505, 41764), (530, 39794), (788, 26765), (985, 21412), (1010, 20882), (1060, 19897), (1970, 10706), (2020, 10441), (3940, 5353)]

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