21681520

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{5531}}^1$

素因数の和:5558

約数の個数: 60

約数和(自身を含む): 58650264

約数和(自身を除く): 36968744

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 5531, 11062, 22124, 27655, 38717, 44248, 55310, 77434, 88496, 110620, 154868, 193585, 221240, 271019, 309736, 387170, 442480, 542038, 619472, 774340, 1084076, 1355095, 1548680, 2168152, 2710190, 3097360, 4336304, 5420380, 10840760, 21681520]

約数ペア:

[(1, 21681520), (2, 10840760), (4, 5420380), (5, 4336304), (7, 3097360), (8, 2710190), (10, 2168152), (14, 1548680), (16, 1355095), (20, 1084076), (28, 774340), (35, 619472), (40, 542038), (49, 442480), (56, 387170), (70, 309736), (80, 271019), (98, 221240), (112, 193585), (140, 154868), (196, 110620), (245, 88496), (280, 77434), (392, 55310), (490, 44248), (560, 38717), (784, 27655), (980, 22124), (1960, 11062), (3920, 5531)]