18851980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{89}}^2$

素因数の和:211

約数の個数: 72

約数和(自身を含む): 48450528

約数和(自身を除く): 29598548

約数列:

[1, 2, 4, 5, 7, 10, 14, 17, 20, 28, 34, 35, 68, 70, 85, 89, 119, 140, 170, 178, 238, 340, 356, 445, 476, 595, 623, 890, 1190, 1246, 1513, 1780, 2380, 2492, 3026, 3115, 6052, 6230, 7565, 7921, 10591, 12460, 15130, 15842, 21182, 30260, 31684, 39605, 42364, 52955, 55447, 79210, 105910, 110894, 134657, 158420, 211820, 221788, 269314, 277235, 538628, 554470, 673285, 942599, 1108940, 1346570, 1885198, 2693140, 3770396, 4712995, 9425990, 18851980]

約数ペア:

[(1, 18851980), (2, 9425990), (4, 4712995), (5, 3770396), (7, 2693140), (10, 1885198), (14, 1346570), (17, 1108940), (20, 942599), (28, 673285), (34, 554470), (35, 538628), (68, 277235), (70, 269314), (85, 221788), (89, 211820), (119, 158420), (140, 134657), (170, 110894), (178, 105910), (238, 79210), (340, 55447), (356, 52955), (445, 42364), (476, 39605), (595, 31684), (623, 30260), (890, 21182), (1190, 15842), (1246, 15130), (1513, 12460), (1780, 10591), (2380, 7921), (2492, 7565), (3026, 6230), (3115, 6052)]