18981380

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^2\times {\mathrm{239}}^1$

素因数の和:297

約数の個数: 72

約数和(自身を含む): 46085760

約数和(自身を除く): 27104380

約数列:

[1, 2, 4, 5, 10, 11, 19, 20, 22, 38, 44, 55, 76, 95, 110, 190, 209, 220, 239, 361, 380, 418, 478, 722, 836, 956, 1045, 1195, 1444, 1805, 2090, 2390, 2629, 3610, 3971, 4180, 4541, 4780, 5258, 7220, 7942, 9082, 10516, 13145, 15884, 18164, 19855, 22705, 26290, 39710, 45410, 49951, 52580, 79420, 86279, 90820, 99902, 172558, 199804, 249755, 345116, 431395, 499510, 862790, 949069, 999020, 1725580, 1898138, 3796276, 4745345, 9490690, 18981380]

約数ペア:

[(1, 18981380), (2, 9490690), (4, 4745345), (5, 3796276), (10, 1898138), (11, 1725580), (19, 999020), (20, 949069), (22, 862790), (38, 499510), (44, 431395), (55, 345116), (76, 249755), (95, 199804), (110, 172558), (190, 99902), (209, 90820), (220, 86279), (239, 79420), (361, 52580), (380, 49951), (418, 45410), (478, 39710), (722, 26290), (836, 22705), (956, 19855), (1045, 18164), (1195, 15884), (1444, 13145), (1805, 10516), (2090, 9082), (2390, 7942), (2629, 7220), (3610, 5258), (3971, 4780), (4180, 4541)]