21128520

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25153}}^1$

素因数の和:25174

約数の個数: 64

約数和(自身を含む): 72443520

約数和(自身を除く): 51315000

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25153, 50306, 75459, 100612, 125765, 150918, 176071, 201224, 251530, 301836, 352142, 377295, 503060, 528213, 603672, 704284, 754590, 880355, 1006120, 1056426, 1408568, 1509180, 1760710, 2112852, 2641065, 3018360, 3521420, 4225704, 5282130, 7042840, 10564260, 21128520]

約数ペア:

[(1, 21128520), (2, 10564260), (3, 7042840), (4, 5282130), (5, 4225704), (6, 3521420), (7, 3018360), (8, 2641065), (10, 2112852), (12, 1760710), (14, 1509180), (15, 1408568), (20, 1056426), (21, 1006120), (24, 880355), (28, 754590), (30, 704284), (35, 603672), (40, 528213), (42, 503060), (56, 377295), (60, 352142), (70, 301836), (84, 251530), (105, 201224), (120, 176071), (140, 150918), (168, 125765), (210, 100612), (280, 75459), (420, 50306), (840, 25153)]