21130400

素因数分解:

$2^5\times 5^2\times {\mathrm{61}}^1\times {\mathrm{433}}^1$

素因数の和:514

約数の個数: 72

約数和(自身を含む): 52551324

約数和(自身を除く): 31420924

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 61, 80, 100, 122, 160, 200, 244, 305, 400, 433, 488, 610, 800, 866, 976, 1220, 1525, 1732, 1952, 2165, 2440, 3050, 3464, 4330, 4880, 6100, 6928, 8660, 9760, 10825, 12200, 13856, 17320, 21650, 24400, 26413, 34640, 43300, 48800, 52826, 69280, 86600, 105652, 132065, 173200, 211304, 264130, 346400, 422608, 528260, 660325, 845216, 1056520, 1320650, 2113040, 2641300, 4226080, 5282600, 10565200, 21130400]

約数ペア:

[(1, 21130400), (2, 10565200), (4, 5282600), (5, 4226080), (8, 2641300), (10, 2113040), (16, 1320650), (20, 1056520), (25, 845216), (32, 660325), (40, 528260), (50, 422608), (61, 346400), (80, 264130), (100, 211304), (122, 173200), (160, 132065), (200, 105652), (244, 86600), (305, 69280), (400, 52826), (433, 48800), (488, 43300), (610, 34640), (800, 26413), (866, 24400), (976, 21650), (1220, 17320), (1525, 13856), (1732, 12200), (1952, 10825), (2165, 9760), (2440, 8660), (3050, 6928), (3464, 6100), (4330, 4880)]