21139660

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{523}}^1$

素因数の和:622

約数の個数: 48

約数和(自身を含む): 46480896

約数和(自身を除く): 25341236

約数列:

[1, 2, 4, 5, 10, 20, 43, 47, 86, 94, 172, 188, 215, 235, 430, 470, 523, 860, 940, 1046, 2021, 2092, 2615, 4042, 5230, 8084, 10105, 10460, 20210, 22489, 24581, 40420, 44978, 49162, 89956, 98324, 112445, 122905, 224890, 245810, 449780, 491620, 1056983, 2113966, 4227932, 5284915, 10569830, 21139660]

約数ペア:

[(1, 21139660), (2, 10569830), (4, 5284915), (5, 4227932), (10, 2113966), (20, 1056983), (43, 491620), (47, 449780), (86, 245810), (94, 224890), (172, 122905), (188, 112445), (215, 98324), (235, 89956), (430, 49162), (470, 44978), (523, 40420), (860, 24581), (940, 22489), (1046, 20210), (2021, 10460), (2092, 10105), (2615, 8084), (4042, 5230)]