21120216

素因数分解:

$2^3\times 3^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{487}}^1$

素因数の和:648

約数の個数: 64

約数和(自身を含む): 57388800

約数和(自身を除く): 36268584

約数列:

[1, 2, 3, 4, 6, 8, 12, 13, 24, 26, 39, 52, 78, 104, 139, 156, 278, 312, 417, 487, 556, 834, 974, 1112, 1461, 1668, 1807, 1948, 2922, 3336, 3614, 3896, 5421, 5844, 6331, 7228, 10842, 11688, 12662, 14456, 18993, 21684, 25324, 37986, 43368, 50648, 67693, 75972, 135386, 151944, 203079, 270772, 406158, 541544, 812316, 880009, 1624632, 1760018, 2640027, 3520036, 5280054, 7040072, 10560108, 21120216]

約数ペア:

[(1, 21120216), (2, 10560108), (3, 7040072), (4, 5280054), (6, 3520036), (8, 2640027), (12, 1760018), (13, 1624632), (24, 880009), (26, 812316), (39, 541544), (52, 406158), (78, 270772), (104, 203079), (139, 151944), (156, 135386), (278, 75972), (312, 67693), (417, 50648), (487, 43368), (556, 37986), (834, 25324), (974, 21684), (1112, 18993), (1461, 14456), (1668, 12662), (1807, 11688), (1948, 10842), (2922, 7228), (3336, 6331), (3614, 5844), (3896, 5421)]