21555820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{7537}}^1$

素因数の和:7570

約数の個数: 48

約数和(自身を含む): 53188128

約数和(自身を除く): 31632308

約数列:

[1, 2, 4, 5, 10, 11, 13, 20, 22, 26, 44, 52, 55, 65, 110, 130, 143, 220, 260, 286, 572, 715, 1430, 2860, 7537, 15074, 30148, 37685, 75370, 82907, 97981, 150740, 165814, 195962, 331628, 391924, 414535, 489905, 829070, 979810, 1077791, 1658140, 1959620, 2155582, 4311164, 5388955, 10777910, 21555820]

約数ペア:

[(1, 21555820), (2, 10777910), (4, 5388955), (5, 4311164), (10, 2155582), (11, 1959620), (13, 1658140), (20, 1077791), (22, 979810), (26, 829070), (44, 489905), (52, 414535), (55, 391924), (65, 331628), (110, 195962), (130, 165814), (143, 150740), (220, 97981), (260, 82907), (286, 75370), (572, 37685), (715, 30148), (1430, 15074), (2860, 7537)]