28807420

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^2$

素因数の和:155

約数の個数: 72

約数和(自身を含む): 66785040

約数和(自身を除く): 37977620

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 41, 43, 76, 82, 86, 95, 164, 172, 190, 205, 215, 380, 410, 430, 779, 817, 820, 860, 1558, 1634, 1763, 1849, 3116, 3268, 3526, 3698, 3895, 4085, 7052, 7396, 7790, 8170, 8815, 9245, 15580, 16340, 17630, 18490, 33497, 35131, 35260, 36980, 66994, 70262, 75809, 133988, 140524, 151618, 167485, 175655, 303236, 334970, 351310, 379045, 669940, 702620, 758090, 1440371, 1516180, 2880742, 5761484, 7201855, 14403710, 28807420]

約数ペア:

[(1, 28807420), (2, 14403710), (4, 7201855), (5, 5761484), (10, 2880742), (19, 1516180), (20, 1440371), (38, 758090), (41, 702620), (43, 669940), (76, 379045), (82, 351310), (86, 334970), (95, 303236), (164, 175655), (172, 167485), (190, 151618), (205, 140524), (215, 133988), (380, 75809), (410, 70262), (430, 66994), (779, 36980), (817, 35260), (820, 35131), (860, 33497), (1558, 18490), (1634, 17630), (1763, 16340), (1849, 15580), (3116, 9245), (3268, 8815), (3526, 8170), (3698, 7790), (3895, 7396), (4085, 7052)]