21215678980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{97}}^1\times {\mathrm{154027}}^1$

素因数の和:154204

約数の個数: 48

約数和(自身を含む): 45646505856

約数和(自身を除く): 24430826876

約数列:

[1, 2, 4, 5, 10, 20, 71, 97, 142, 194, 284, 355, 388, 485, 710, 970, 1420, 1940, 6887, 13774, 27548, 34435, 68870, 137740, 154027, 308054, 616108, 770135, 1540270, 3080540, 10935917, 14940619, 21871834, 29881238, 43743668, 54679585, 59762476, 74703095, 109359170, 149406190, 218718340, 298812380, 1060783949, 2121567898, 4243135796, 5303919745, 10607839490, 21215678980]

約数ペア:

[(1, 21215678980), (2, 10607839490), (4, 5303919745), (5, 4243135796), (10, 2121567898), (20, 1060783949), (71, 298812380), (97, 218718340), (142, 149406190), (194, 109359170), (284, 74703095), (355, 59762476), (388, 54679585), (485, 43743668), (710, 29881238), (970, 21871834), (1420, 14940619), (1940, 10935917), (6887, 3080540), (13774, 1540270), (27548, 770135), (34435, 616108), (68870, 308054), (137740, 154027)]