20428900

素因数分解:

$2^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{197}}^1$

素因数の和:289

約数の個数: 72

約数和(自身を含む): 47950056

約数和(自身を除く): 27521156

約数列:

[1, 2, 4, 5, 10, 17, 20, 25, 34, 50, 61, 68, 85, 100, 122, 170, 197, 244, 305, 340, 394, 425, 610, 788, 850, 985, 1037, 1220, 1525, 1700, 1970, 2074, 3050, 3349, 3940, 4148, 4925, 5185, 6100, 6698, 9850, 10370, 12017, 13396, 16745, 19700, 20740, 24034, 25925, 33490, 48068, 51850, 60085, 66980, 83725, 103700, 120170, 167450, 204289, 240340, 300425, 334900, 408578, 600850, 817156, 1021445, 1201700, 2042890, 4085780, 5107225, 10214450, 20428900]

約数ペア:

[(1, 20428900), (2, 10214450), (4, 5107225), (5, 4085780), (10, 2042890), (17, 1201700), (20, 1021445), (25, 817156), (34, 600850), (50, 408578), (61, 334900), (68, 300425), (85, 240340), (100, 204289), (122, 167450), (170, 120170), (197, 103700), (244, 83725), (305, 66980), (340, 60085), (394, 51850), (425, 48068), (610, 33490), (788, 25925), (850, 24034), (985, 20740), (1037, 19700), (1220, 16745), (1525, 13396), (1700, 12017), (1970, 10370), (2074, 9850), (3050, 6698), (3349, 6100), (3940, 5185), (4148, 4925)]