About the Number

9780020

9780019 ← → 9780021

2進数表記:100101010011101100110100

漢数字表記:九百七十八万二十

素因数分解:

2 2 × 5 1 × 489001 1

素因数の和:489010
約数の個数: 12
約数和(自身を含む): 20538084
約数和(自身を除く): 10758064

約数列:
[1, 2, 4, 5, 10, 20, 489001, 978002, 1956004, 2445005, 4890010, 9780020]

約数ペア:
[(1, 9780020), (2, 4890010), (4, 2445005), (5, 1956004), (10, 978002), (20, 489001)]

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