21032800

素因数分解:

$2^5\times 5^2\times {\mathrm{61}}^1\times {\mathrm{431}}^1$

素因数の和:512

約数の個数: 72

約数和(自身を含む): 52309152

約数和(自身を除く): 31276352

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 61, 80, 100, 122, 160, 200, 244, 305, 400, 431, 488, 610, 800, 862, 976, 1220, 1525, 1724, 1952, 2155, 2440, 3050, 3448, 4310, 4880, 6100, 6896, 8620, 9760, 10775, 12200, 13792, 17240, 21550, 24400, 26291, 34480, 43100, 48800, 52582, 68960, 86200, 105164, 131455, 172400, 210328, 262910, 344800, 420656, 525820, 657275, 841312, 1051640, 1314550, 2103280, 2629100, 4206560, 5258200, 10516400, 21032800]

約数ペア:

[(1, 21032800), (2, 10516400), (4, 5258200), (5, 4206560), (8, 2629100), (10, 2103280), (16, 1314550), (20, 1051640), (25, 841312), (32, 657275), (40, 525820), (50, 420656), (61, 344800), (80, 262910), (100, 210328), (122, 172400), (160, 131455), (200, 105164), (244, 86200), (305, 68960), (400, 52582), (431, 48800), (488, 43100), (610, 34480), (800, 26291), (862, 24400), (976, 21550), (1220, 17240), (1525, 13792), (1724, 12200), (1952, 10775), (2155, 9760), (2440, 8620), (3050, 6896), (3448, 6100), (4310, 4880)]