21378520

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{149}}^1\times {\mathrm{211}}^1$

素因数の和:388

約数の個数: 64

約数和(自身を含む): 51516000

約数和(自身を除く): 30137480

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 149, 170, 211, 298, 340, 422, 596, 680, 745, 844, 1055, 1192, 1490, 1688, 2110, 2533, 2980, 3587, 4220, 5066, 5960, 7174, 8440, 10132, 12665, 14348, 17935, 20264, 25330, 28696, 31439, 35870, 50660, 62878, 71740, 101320, 125756, 143480, 157195, 251512, 314390, 534463, 628780, 1068926, 1257560, 2137852, 2672315, 4275704, 5344630, 10689260, 21378520]

約数ペア:

[(1, 21378520), (2, 10689260), (4, 5344630), (5, 4275704), (8, 2672315), (10, 2137852), (17, 1257560), (20, 1068926), (34, 628780), (40, 534463), (68, 314390), (85, 251512), (136, 157195), (149, 143480), (170, 125756), (211, 101320), (298, 71740), (340, 62878), (422, 50660), (596, 35870), (680, 31439), (745, 28696), (844, 25330), (1055, 20264), (1192, 17935), (1490, 14348), (1688, 12665), (2110, 10132), (2533, 8440), (2980, 7174), (3587, 5960), (4220, 5066)]