640387390

素因数分解:

$2^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{887}}^1$

素因数の和:1033

約数の個数: 64

約数和(自身を含む): 1249053696

約数和(自身を除く): 608666306

約数列:

[1, 2, 5, 10, 23, 43, 46, 73, 86, 115, 146, 215, 230, 365, 430, 730, 887, 989, 1679, 1774, 1978, 3139, 3358, 4435, 4945, 6278, 8395, 8870, 9890, 15695, 16790, 20401, 31390, 38141, 40802, 64751, 72197, 76282, 102005, 129502, 144394, 190705, 204010, 323755, 360985, 381410, 647510, 721970, 877243, 1489273, 1754486, 2784293, 2978546, 4386215, 5568586, 7446365, 8772430, 13921465, 14892730, 27842930, 64038739, 128077478, 320193695, 640387390]

約数ペア:

[(1, 640387390), (2, 320193695), (5, 128077478), (10, 64038739), (23, 27842930), (43, 14892730), (46, 13921465), (73, 8772430), (86, 7446365), (115, 5568586), (146, 4386215), (215, 2978546), (230, 2784293), (365, 1754486), (430, 1489273), (730, 877243), (887, 721970), (989, 647510), (1679, 381410), (1774, 360985), (1978, 323755), (3139, 204010), (3358, 190705), (4435, 144394), (4945, 129502), (6278, 102005), (8395, 76282), (8870, 72197), (9890, 64751), (15695, 40802), (16790, 38141), (20401, 31390)]