21997910

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{6451}}^1$

素因数の和:6500

約数の個数: 32

約数和(自身を含む): 44596224

約数和(自身を除く): 22598314

約数列:

[1, 2, 5, 10, 11, 22, 31, 55, 62, 110, 155, 310, 341, 682, 1705, 3410, 6451, 12902, 32255, 64510, 70961, 141922, 199981, 354805, 399962, 709610, 999905, 1999810, 2199791, 4399582, 10998955, 21997910]

約数ペア:

[(1, 21997910), (2, 10998955), (5, 4399582), (10, 2199791), (11, 1999810), (22, 999905), (31, 709610), (55, 399962), (62, 354805), (110, 199981), (155, 141922), (310, 70961), (341, 64510), (682, 32255), (1705, 12902), (3410, 6451)]