12781720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{191}}^1\times {\mathrm{239}}^1$

素因数の和:448

約数の個数: 64

約数和(自身を含む): 33177600

約数和(自身を除く): 20395880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 191, 239, 280, 382, 478, 764, 955, 956, 1195, 1337, 1528, 1673, 1910, 1912, 2390, 2674, 3346, 3820, 4780, 5348, 6685, 6692, 7640, 8365, 9560, 10696, 13370, 13384, 16730, 26740, 33460, 45649, 53480, 66920, 91298, 182596, 228245, 319543, 365192, 456490, 639086, 912980, 1278172, 1597715, 1825960, 2556344, 3195430, 6390860, 12781720]

約数ペア:

[(1, 12781720), (2, 6390860), (4, 3195430), (5, 2556344), (7, 1825960), (8, 1597715), (10, 1278172), (14, 912980), (20, 639086), (28, 456490), (35, 365192), (40, 319543), (56, 228245), (70, 182596), (140, 91298), (191, 66920), (239, 53480), (280, 45649), (382, 33460), (478, 26740), (764, 16730), (955, 13384), (956, 13370), (1195, 10696), (1337, 9560), (1528, 8365), (1673, 7640), (1910, 6692), (1912, 6685), (2390, 5348), (2674, 4780), (3346, 3820)]