20288440

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 47628000

約数和(自身を除く): 27339560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 89, 139, 164, 178, 205, 278, 328, 356, 410, 445, 556, 695, 712, 820, 890, 1112, 1390, 1640, 1780, 2780, 3560, 3649, 5560, 5699, 7298, 11398, 12371, 14596, 18245, 22796, 24742, 28495, 29192, 36490, 45592, 49484, 56990, 61855, 72980, 98968, 113980, 123710, 145960, 227960, 247420, 494840, 507211, 1014422, 2028844, 2536055, 4057688, 5072110, 10144220, 20288440]

約数ペア:

[(1, 20288440), (2, 10144220), (4, 5072110), (5, 4057688), (8, 2536055), (10, 2028844), (20, 1014422), (40, 507211), (41, 494840), (82, 247420), (89, 227960), (139, 145960), (164, 123710), (178, 113980), (205, 98968), (278, 72980), (328, 61855), (356, 56990), (410, 49484), (445, 45592), (556, 36490), (695, 29192), (712, 28495), (820, 24742), (890, 22796), (1112, 18245), (1390, 14596), (1640, 12371), (1780, 11398), (2780, 7298), (3560, 5699), (3649, 5560)]