21689080

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1091}}^1$

素因数の和:1180

約数の個数: 64

約数和(自身を含む): 56609280

約数和(自身を除く): 34920200

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 71, 140, 142, 280, 284, 355, 497, 568, 710, 994, 1091, 1420, 1988, 2182, 2485, 2840, 3976, 4364, 4970, 5455, 7637, 8728, 9940, 10910, 15274, 19880, 21820, 30548, 38185, 43640, 61096, 76370, 77461, 152740, 154922, 305480, 309844, 387305, 542227, 619688, 774610, 1084454, 1549220, 2168908, 2711135, 3098440, 4337816, 5422270, 10844540, 21689080]

約数ペア:

[(1, 21689080), (2, 10844540), (4, 5422270), (5, 4337816), (7, 3098440), (8, 2711135), (10, 2168908), (14, 1549220), (20, 1084454), (28, 774610), (35, 619688), (40, 542227), (56, 387305), (70, 309844), (71, 305480), (140, 154922), (142, 152740), (280, 77461), (284, 76370), (355, 61096), (497, 43640), (568, 38185), (710, 30548), (994, 21820), (1091, 19880), (1420, 15274), (1988, 10910), (2182, 9940), (2485, 8728), (2840, 7637), (3976, 5455), (4364, 4970)]