21877940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{71}}^2$

素因数の和:189

約数の個数: 72

約数和(自身を含む): 54974976

約数和(自身を除く): 33097036

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 71, 124, 140, 142, 155, 217, 284, 310, 355, 434, 497, 620, 710, 868, 994, 1085, 1420, 1988, 2170, 2201, 2485, 4340, 4402, 4970, 5041, 8804, 9940, 10082, 11005, 15407, 20164, 22010, 25205, 30814, 35287, 44020, 50410, 61628, 70574, 77035, 100820, 141148, 154070, 156271, 176435, 308140, 312542, 352870, 625084, 705740, 781355, 1093897, 1562710, 2187794, 3125420, 4375588, 5469485, 10938970, 21877940]

約数ペア:

[(1, 21877940), (2, 10938970), (4, 5469485), (5, 4375588), (7, 3125420), (10, 2187794), (14, 1562710), (20, 1093897), (28, 781355), (31, 705740), (35, 625084), (62, 352870), (70, 312542), (71, 308140), (124, 176435), (140, 156271), (142, 154070), (155, 141148), (217, 100820), (284, 77035), (310, 70574), (355, 61628), (434, 50410), (497, 44020), (620, 35287), (710, 30814), (868, 25205), (994, 22010), (1085, 20164), (1420, 15407), (1988, 11005), (2170, 10082), (2201, 9940), (2485, 8804), (4340, 5041), (4402, 4970)]