About the Number

20131220

20131219 ← → 20131221

2進数表記:1001100110010110110010100

漢数字表記:二千十三万千二百二十

素因数分解:

2 2 × 5 1 × 29 1 × 61 1 × 569 1

素因数の和:668
約数の個数: 48
約数和(自身を含む): 44528400
約数和(自身を除く): 24397180

約数列:
[1, 2, 4, 5, 10, 20, 29, 58, 61, 116, 122, 145, 244, 290, 305, 569, 580, 610, 1138, 1220, 1769, 2276, 2845, 3538, 5690, 7076, 8845, 11380, 16501, 17690, 33002, 34709, 35380, 66004, 69418, 82505, 138836, 165010, 173545, 330020, 347090, 694180, 1006561, 2013122, 4026244, 5032805, 10065610, 20131220]

約数ペア:
[(1, 20131220), (2, 10065610), (4, 5032805), (5, 4026244), (10, 2013122), (20, 1006561), (29, 694180), (58, 347090), (61, 330020), (116, 173545), (122, 165010), (145, 138836), (244, 82505), (290, 69418), (305, 66004), (569, 35380), (580, 34709), (610, 33002), (1138, 17690), (1220, 16501), (1769, 11380), (2276, 8845), (2845, 7076), (3538, 5690)]

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