About the Number

81871890

81871889 ← → 81871891

2進数表記:100111000010100010000010010

漢数字表記:八千百八十七万千八百九十

素因数分解:

2 1 × 3 1 × 5 1 × 113 1 × 24151 1

素因数の和:24274
約数の個数: 32
約数和(自身を含む): 198239616
約数和(自身を除く): 116367726

約数列:
[1, 2, 3, 5, 6, 10, 15, 30, 113, 226, 339, 565, 678, 1130, 1695, 3390, 24151, 48302, 72453, 120755, 144906, 241510, 362265, 724530, 2729063, 5458126, 8187189, 13645315, 16374378, 27290630, 40935945, 81871890]

約数ペア:
[(1, 81871890), (2, 40935945), (3, 27290630), (5, 16374378), (6, 13645315), (10, 8187189), (15, 5458126), (30, 2729063), (113, 724530), (226, 362265), (339, 241510), (565, 144906), (678, 120755), (1130, 72453), (1695, 48302), (3390, 24151)]

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