20915890

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{331}}^1$

素因数の和:498

約数の個数: 32

約数和(自身を含む): 38724480

約数和(自身を除く): 17808590

約数列:

[1, 2, 5, 10, 71, 89, 142, 178, 331, 355, 445, 662, 710, 890, 1655, 3310, 6319, 12638, 23501, 29459, 31595, 47002, 58918, 63190, 117505, 147295, 235010, 294590, 2091589, 4183178, 10457945, 20915890]

約数ペア:

[(1, 20915890), (2, 10457945), (5, 4183178), (10, 2091589), (71, 294590), (89, 235010), (142, 147295), (178, 117505), (331, 63190), (355, 58918), (445, 47002), (662, 31595), (710, 29459), (890, 23501), (1655, 12638), (3310, 6319)]