21957560

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8999}}^1$

素因数の和:9071

約数の個数: 32

約数和(自身を含む): 50220000

約数和(自身を除く): 28262440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8999, 17998, 35996, 44995, 71992, 89990, 179980, 359960, 548939, 1097878, 2195756, 2744695, 4391512, 5489390, 10978780, 21957560]

約数ペア:

[(1, 21957560), (2, 10978780), (4, 5489390), (5, 4391512), (8, 2744695), (10, 2195756), (20, 1097878), (40, 548939), (61, 359960), (122, 179980), (244, 89990), (305, 71992), (488, 44995), (610, 35996), (1220, 17998), (2440, 8999)]