18918536

素因数分解:

$2^3\times 7^1\times {\mathrm{13}}^2\times {\mathrm{1999}}^1$

素因数の和:2038

約数の個数: 48

約数和(自身を含む): 43920000

約数和(自身を除く): 25001464

約数列:

[1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 169, 182, 338, 364, 676, 728, 1183, 1352, 1999, 2366, 3998, 4732, 7996, 9464, 13993, 15992, 25987, 27986, 51974, 55972, 103948, 111944, 181909, 207896, 337831, 363818, 675662, 727636, 1351324, 1455272, 2364817, 2702648, 4729634, 9459268, 18918536]

約数ペア:

[(1, 18918536), (2, 9459268), (4, 4729634), (7, 2702648), (8, 2364817), (13, 1455272), (14, 1351324), (26, 727636), (28, 675662), (52, 363818), (56, 337831), (91, 207896), (104, 181909), (169, 111944), (182, 103948), (338, 55972), (364, 51974), (676, 27986), (728, 25987), (1183, 15992), (1352, 13993), (1999, 9464), (2366, 7996), (3998, 4732)]