20414720

素因数分解:

$2^8\times 5^1\times {\mathrm{41}}^1\times {\mathrm{389}}^1$

素因数の和:451

約数の個数: 72

約数和(自身を含む): 50221080

約数和(自身を除く): 29806360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 256, 320, 328, 389, 410, 640, 656, 778, 820, 1280, 1312, 1556, 1640, 1945, 2624, 3112, 3280, 3890, 5248, 6224, 6560, 7780, 10496, 12448, 13120, 15560, 15949, 24896, 26240, 31120, 31898, 49792, 52480, 62240, 63796, 79745, 99584, 124480, 127592, 159490, 248960, 255184, 318980, 497920, 510368, 637960, 1020736, 1275920, 2041472, 2551840, 4082944, 5103680, 10207360, 20414720]

約数ペア:

[(1, 20414720), (2, 10207360), (4, 5103680), (5, 4082944), (8, 2551840), (10, 2041472), (16, 1275920), (20, 1020736), (32, 637960), (40, 510368), (41, 497920), (64, 318980), (80, 255184), (82, 248960), (128, 159490), (160, 127592), (164, 124480), (205, 99584), (256, 79745), (320, 63796), (328, 62240), (389, 52480), (410, 49792), (640, 31898), (656, 31120), (778, 26240), (820, 24896), (1280, 15949), (1312, 15560), (1556, 13120), (1640, 12448), (1945, 10496), (2624, 7780), (3112, 6560), (3280, 6224), (3890, 5248)]