1640668840

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{157}}^1\times {\mathrm{3307}}^1$

素因数の和:3554

約数の個数: 64

約数和(自身を含む): 3763180800

約数和(自身を除く): 2122511960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 157, 158, 314, 316, 395, 628, 632, 785, 790, 1256, 1570, 1580, 3140, 3160, 3307, 6280, 6614, 12403, 13228, 16535, 24806, 26456, 33070, 49612, 62015, 66140, 99224, 124030, 132280, 248060, 261253, 496120, 519199, 522506, 1038398, 1045012, 1306265, 2076796, 2090024, 2595995, 2612530, 4153592, 5191990, 5225060, 10383980, 10450120, 20767960, 41016721, 82033442, 164066884, 205083605, 328133768, 410167210, 820334420, 1640668840]

約数ペア:

[(1, 1640668840), (2, 820334420), (4, 410167210), (5, 328133768), (8, 205083605), (10, 164066884), (20, 82033442), (40, 41016721), (79, 20767960), (157, 10450120), (158, 10383980), (314, 5225060), (316, 5191990), (395, 4153592), (628, 2612530), (632, 2595995), (785, 2090024), (790, 2076796), (1256, 1306265), (1570, 1045012), (1580, 1038398), (3140, 522506), (3160, 519199), (3307, 496120), (6280, 261253), (6614, 248060), (12403, 132280), (13228, 124030), (16535, 99224), (24806, 66140), (26456, 62015), (33070, 49612)]