16981180

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{449}}^1$

素因数の和:550

約数の個数: 48

約数和(自身を含む): 37497600

約数和(自身を除く): 20516420

約数列:

[1, 2, 4, 5, 10, 20, 31, 61, 62, 122, 124, 155, 244, 305, 310, 449, 610, 620, 898, 1220, 1796, 1891, 2245, 3782, 4490, 7564, 8980, 9455, 13919, 18910, 27389, 27838, 37820, 54778, 55676, 69595, 109556, 136945, 139190, 273890, 278380, 547780, 849059, 1698118, 3396236, 4245295, 8490590, 16981180]

約数ペア:

[(1, 16981180), (2, 8490590), (4, 4245295), (5, 3396236), (10, 1698118), (20, 849059), (31, 547780), (61, 278380), (62, 273890), (122, 139190), (124, 136945), (155, 109556), (244, 69595), (305, 55676), (310, 54778), (449, 37820), (610, 27838), (620, 27389), (898, 18910), (1220, 13919), (1796, 9455), (1891, 8980), (2245, 7564), (3782, 4490)]