18195880

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{149}}^1$

素因数の和:274

約数の個数: 64

約数和(自身を含む): 42768000

約数和(自身を除く): 24572120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 71, 86, 142, 149, 172, 215, 284, 298, 344, 355, 430, 568, 596, 710, 745, 860, 1192, 1420, 1490, 1720, 2840, 2980, 3053, 5960, 6106, 6407, 10579, 12212, 12814, 15265, 21158, 24424, 25628, 30530, 32035, 42316, 51256, 52895, 61060, 64070, 84632, 105790, 122120, 128140, 211580, 256280, 423160, 454897, 909794, 1819588, 2274485, 3639176, 4548970, 9097940, 18195880]

約数ペア:

[(1, 18195880), (2, 9097940), (4, 4548970), (5, 3639176), (8, 2274485), (10, 1819588), (20, 909794), (40, 454897), (43, 423160), (71, 256280), (86, 211580), (142, 128140), (149, 122120), (172, 105790), (215, 84632), (284, 64070), (298, 61060), (344, 52895), (355, 51256), (430, 42316), (568, 32035), (596, 30530), (710, 25628), (745, 24424), (860, 21158), (1192, 15265), (1420, 12814), (1490, 12212), (1720, 10579), (2840, 6407), (2980, 6106), (3053, 5960)]