19935860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{907}}^1$

素因数の和:1080

約数の個数: 48

約数和(自身を含む): 48203904

約数和(自身を除く): 28268044

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 907, 1099, 1570, 1814, 2198, 3140, 3628, 4396, 4535, 5495, 6349, 9070, 10990, 12698, 18140, 21980, 25396, 31745, 63490, 126980, 142399, 284798, 569596, 711995, 996793, 1423990, 1993586, 2847980, 3987172, 4983965, 9967930, 19935860]

約数ペア:

[(1, 19935860), (2, 9967930), (4, 4983965), (5, 3987172), (7, 2847980), (10, 1993586), (14, 1423990), (20, 996793), (28, 711995), (35, 569596), (70, 284798), (140, 142399), (157, 126980), (314, 63490), (628, 31745), (785, 25396), (907, 21980), (1099, 18140), (1570, 12698), (1814, 10990), (2198, 9070), (3140, 6349), (3628, 5495), (4396, 4535)]