18981920

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1$

素因数の和:178

約数の個数: 96

約数和(自身を含む): 47900160

約数和(自身を除く): 28918240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 43, 62, 80, 86, 89, 124, 155, 160, 172, 178, 215, 248, 310, 344, 356, 430, 445, 496, 620, 688, 712, 860, 890, 992, 1240, 1333, 1376, 1424, 1720, 1780, 2480, 2666, 2759, 2848, 3440, 3560, 3827, 4960, 5332, 5518, 6665, 6880, 7120, 7654, 10664, 11036, 13330, 13795, 14240, 15308, 19135, 21328, 22072, 26660, 27590, 30616, 38270, 42656, 44144, 53320, 55180, 61232, 76540, 88288, 106640, 110360, 118637, 122464, 153080, 213280, 220720, 237274, 306160, 441440, 474548, 593185, 612320, 949096, 1186370, 1898192, 2372740, 3796384, 4745480, 9490960, 18981920]

約数ペア:

[(1, 18981920), (2, 9490960), (4, 4745480), (5, 3796384), (8, 2372740), (10, 1898192), (16, 1186370), (20, 949096), (31, 612320), (32, 593185), (40, 474548), (43, 441440), (62, 306160), (80, 237274), (86, 220720), (89, 213280), (124, 153080), (155, 122464), (160, 118637), (172, 110360), (178, 106640), (215, 88288), (248, 76540), (310, 61232), (344, 55180), (356, 53320), (430, 44144), (445, 42656), (496, 38270), (620, 30616), (688, 27590), (712, 26660), (860, 22072), (890, 21328), (992, 19135), (1240, 15308), (1333, 14240), (1376, 13795), (1424, 13330), (1720, 11036), (1780, 10664), (2480, 7654), (2666, 7120), (2759, 6880), (2848, 6665), (3440, 5518), (3560, 5332), (3827, 4960)]