21371428

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{97}}^1\times {\mathrm{223}}^1$

素因数の和:356

約数の個数: 48

約数和(自身を含む): 43025920

約数和(自身を除く): 21654492

約数列:

[1, 2, 4, 13, 19, 26, 38, 52, 76, 97, 194, 223, 247, 388, 446, 494, 892, 988, 1261, 1843, 2522, 2899, 3686, 4237, 5044, 5798, 7372, 8474, 11596, 16948, 21631, 23959, 43262, 47918, 55081, 86524, 95836, 110162, 220324, 281203, 410989, 562406, 821978, 1124812, 1643956, 5342857, 10685714, 21371428]

約数ペア:

[(1, 21371428), (2, 10685714), (4, 5342857), (13, 1643956), (19, 1124812), (26, 821978), (38, 562406), (52, 410989), (76, 281203), (97, 220324), (194, 110162), (223, 95836), (247, 86524), (388, 55081), (446, 47918), (494, 43262), (892, 23959), (988, 21631), (1261, 16948), (1843, 11596), (2522, 8474), (2899, 7372), (3686, 5798), (4237, 5044)]