21255660

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{263}}^1\times {\mathrm{449}}^1$

素因数の和:727

約数の個数: 72

約数和(自身を含む): 64864800

約数和(自身を除く): 43609140

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 263, 449, 526, 789, 898, 1052, 1315, 1347, 1578, 1796, 2245, 2367, 2630, 2694, 3156, 3945, 4041, 4490, 4734, 5260, 5388, 6735, 7890, 8082, 8980, 9468, 11835, 13470, 15780, 16164, 20205, 23670, 26940, 40410, 47340, 80820, 118087, 236174, 354261, 472348, 590435, 708522, 1062783, 1180870, 1417044, 1771305, 2125566, 2361740, 3542610, 4251132, 5313915, 7085220, 10627830, 21255660]

約数ペア:

[(1, 21255660), (2, 10627830), (3, 7085220), (4, 5313915), (5, 4251132), (6, 3542610), (9, 2361740), (10, 2125566), (12, 1771305), (15, 1417044), (18, 1180870), (20, 1062783), (30, 708522), (36, 590435), (45, 472348), (60, 354261), (90, 236174), (180, 118087), (263, 80820), (449, 47340), (526, 40410), (789, 26940), (898, 23670), (1052, 20205), (1315, 16164), (1347, 15780), (1578, 13470), (1796, 11835), (2245, 9468), (2367, 8980), (2630, 8082), (2694, 7890), (3156, 6735), (3945, 5388), (4041, 5260), (4490, 4734)]