20890280

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{991}}^1$

素因数の和:1050

約数の個数: 64

約数和(自身を含む): 51425280

約数和(自身を除く): 30535000

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 991, 1054, 1240, 1982, 2108, 2635, 3964, 4216, 4955, 5270, 7928, 9910, 10540, 16847, 19820, 21080, 30721, 33694, 39640, 61442, 67388, 84235, 122884, 134776, 153605, 168470, 245768, 307210, 336940, 522257, 614420, 673880, 1044514, 1228840, 2089028, 2611285, 4178056, 5222570, 10445140, 20890280]

約数ペア:

[(1, 20890280), (2, 10445140), (4, 5222570), (5, 4178056), (8, 2611285), (10, 2089028), (17, 1228840), (20, 1044514), (31, 673880), (34, 614420), (40, 522257), (62, 336940), (68, 307210), (85, 245768), (124, 168470), (136, 153605), (155, 134776), (170, 122884), (248, 84235), (310, 67388), (340, 61442), (527, 39640), (620, 33694), (680, 30721), (991, 21080), (1054, 19820), (1240, 16847), (1982, 10540), (2108, 9910), (2635, 7928), (3964, 5270), (4216, 4955)]