20871920

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{149}}^1$

素因数の和:282

約数の個数: 80

約数和(自身を含む): 52228800

約数和(自身を除く): 31356880

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 103, 136, 149, 170, 206, 272, 298, 340, 412, 515, 596, 680, 745, 824, 1030, 1192, 1360, 1490, 1648, 1751, 2060, 2384, 2533, 2980, 3502, 4120, 5066, 5960, 7004, 8240, 8755, 10132, 11920, 12665, 14008, 15347, 17510, 20264, 25330, 28016, 30694, 35020, 40528, 50660, 61388, 70040, 76735, 101320, 122776, 140080, 153470, 202640, 245552, 260899, 306940, 521798, 613880, 1043596, 1227760, 1304495, 2087192, 2608990, 4174384, 5217980, 10435960, 20871920]

約数ペア:

[(1, 20871920), (2, 10435960), (4, 5217980), (5, 4174384), (8, 2608990), (10, 2087192), (16, 1304495), (17, 1227760), (20, 1043596), (34, 613880), (40, 521798), (68, 306940), (80, 260899), (85, 245552), (103, 202640), (136, 153470), (149, 140080), (170, 122776), (206, 101320), (272, 76735), (298, 70040), (340, 61388), (412, 50660), (515, 40528), (596, 35020), (680, 30694), (745, 28016), (824, 25330), (1030, 20264), (1192, 17510), (1360, 15347), (1490, 14008), (1648, 12665), (1751, 11920), (2060, 10132), (2384, 8755), (2533, 8240), (2980, 7004), (3502, 5960), (4120, 5066)]