20840560

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{691}}^1$

素因数の和:746

約数の個数: 80

約数和(自身を含む): 54059040

約数和(自身を除く): 33218480

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 29, 40, 52, 58, 65, 80, 104, 116, 130, 145, 208, 232, 260, 290, 377, 464, 520, 580, 691, 754, 1040, 1160, 1382, 1508, 1885, 2320, 2764, 3016, 3455, 3770, 5528, 6032, 6910, 7540, 8983, 11056, 13820, 15080, 17966, 20039, 27640, 30160, 35932, 40078, 44915, 55280, 71864, 80156, 89830, 100195, 143728, 160312, 179660, 200390, 260507, 320624, 359320, 400780, 521014, 718640, 801560, 1042028, 1302535, 1603120, 2084056, 2605070, 4168112, 5210140, 10420280, 20840560]

約数ペア:

[(1, 20840560), (2, 10420280), (4, 5210140), (5, 4168112), (8, 2605070), (10, 2084056), (13, 1603120), (16, 1302535), (20, 1042028), (26, 801560), (29, 718640), (40, 521014), (52, 400780), (58, 359320), (65, 320624), (80, 260507), (104, 200390), (116, 179660), (130, 160312), (145, 143728), (208, 100195), (232, 89830), (260, 80156), (290, 71864), (377, 55280), (464, 44915), (520, 40078), (580, 35932), (691, 30160), (754, 27640), (1040, 20039), (1160, 17966), (1382, 15080), (1508, 13820), (1885, 11056), (2320, 8983), (2764, 7540), (3016, 6910), (3455, 6032), (3770, 5528)]