21020785640

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{1663}}^1\times {\mathrm{7349}}^1$

素因数の和:9066

約数の個数: 64

約数和(自身を含む): 48432384000

約数和(自身を除く): 27411598360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1663, 1720, 3326, 6652, 7349, 8315, 13304, 14698, 16630, 29396, 33260, 36745, 58792, 66520, 71509, 73490, 143018, 146980, 286036, 293960, 316007, 357545, 572072, 632014, 715090, 1264028, 1430180, 1580035, 2528056, 2860360, 3160070, 6320140, 12221387, 12640280, 24442774, 48885548, 61106935, 97771096, 122213870, 244427740, 488855480, 525519641, 1051039282, 2102078564, 2627598205, 4204157128, 5255196410, 10510392820, 21020785640]

約数ペア:

[(1, 21020785640), (2, 10510392820), (4, 5255196410), (5, 4204157128), (8, 2627598205), (10, 2102078564), (20, 1051039282), (40, 525519641), (43, 488855480), (86, 244427740), (172, 122213870), (215, 97771096), (344, 61106935), (430, 48885548), (860, 24442774), (1663, 12640280), (1720, 12221387), (3326, 6320140), (6652, 3160070), (7349, 2860360), (8315, 2528056), (13304, 1580035), (14698, 1430180), (16630, 1264028), (29396, 715090), (33260, 632014), (36745, 572072), (58792, 357545), (66520, 316007), (71509, 293960), (73490, 286036), (143018, 146980)]