21383120

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^2\times {\mathrm{47}}^2$

素因数の和:129

約数の個数: 90

約数和(自身を含む): 55833666

約数和(自身を除く): 34450546

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 47, 55, 80, 88, 94, 110, 121, 176, 188, 220, 235, 242, 376, 440, 470, 484, 517, 605, 752, 880, 940, 968, 1034, 1210, 1880, 1936, 2068, 2209, 2420, 2585, 3760, 4136, 4418, 4840, 5170, 5687, 8272, 8836, 9680, 10340, 11045, 11374, 17672, 20680, 22090, 22748, 24299, 28435, 35344, 41360, 44180, 45496, 48598, 56870, 88360, 90992, 97196, 113740, 121495, 176720, 194392, 227480, 242990, 267289, 388784, 454960, 485980, 534578, 971960, 1069156, 1336445, 1943920, 2138312, 2672890, 4276624, 5345780, 10691560, 21383120]

約数ペア:

[(1, 21383120), (2, 10691560), (4, 5345780), (5, 4276624), (8, 2672890), (10, 2138312), (11, 1943920), (16, 1336445), (20, 1069156), (22, 971960), (40, 534578), (44, 485980), (47, 454960), (55, 388784), (80, 267289), (88, 242990), (94, 227480), (110, 194392), (121, 176720), (176, 121495), (188, 113740), (220, 97196), (235, 90992), (242, 88360), (376, 56870), (440, 48598), (470, 45496), (484, 44180), (517, 41360), (605, 35344), (752, 28435), (880, 24299), (940, 22748), (968, 22090), (1034, 20680), (1210, 17672), (1880, 11374), (1936, 11045), (2068, 10340), (2209, 9680), (2420, 8836), (2585, 8272), (3760, 5687), (4136, 5170), (4418, 4840)]