19987980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{131}}^1\times {\mathrm{2543}}^1$

素因数の和:2686

約数の個数: 48

約数和(自身を含む): 56415744

約数和(自身を除く): 36427764

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 131, 262, 393, 524, 655, 786, 1310, 1572, 1965, 2543, 2620, 3930, 5086, 7629, 7860, 10172, 12715, 15258, 25430, 30516, 38145, 50860, 76290, 152580, 333133, 666266, 999399, 1332532, 1665665, 1998798, 3331330, 3997596, 4996995, 6662660, 9993990, 19987980]

約数ペア:

[(1, 19987980), (2, 9993990), (3, 6662660), (4, 4996995), (5, 3997596), (6, 3331330), (10, 1998798), (12, 1665665), (15, 1332532), (20, 999399), (30, 666266), (60, 333133), (131, 152580), (262, 76290), (393, 50860), (524, 38145), (655, 30516), (786, 25430), (1310, 15258), (1572, 12715), (1965, 10172), (2543, 7860), (2620, 7629), (3930, 5086)]