81682420

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1\times {\mathrm{421}}^1$

素因数の和:628

約数の個数: 48

約数和(自身を含む): 175467600

約数和(自身を除く): 93785180

約数列:

[1, 2, 4, 5, 10, 20, 89, 109, 178, 218, 356, 421, 436, 445, 545, 842, 890, 1090, 1684, 1780, 2105, 2180, 4210, 8420, 9701, 19402, 37469, 38804, 45889, 48505, 74938, 91778, 97010, 149876, 183556, 187345, 194020, 229445, 374690, 458890, 749380, 917780, 4084121, 8168242, 16336484, 20420605, 40841210, 81682420]

約数ペア:

[(1, 81682420), (2, 40841210), (4, 20420605), (5, 16336484), (10, 8168242), (20, 4084121), (89, 917780), (109, 749380), (178, 458890), (218, 374690), (356, 229445), (421, 194020), (436, 187345), (445, 183556), (545, 149876), (842, 97010), (890, 91778), (1090, 74938), (1684, 48505), (1780, 45889), (2105, 38804), (2180, 37469), (4210, 19402), (8420, 9701)]