20780440

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12671}}^1$

素因数の和:12723

約数の個数: 32

約数和(自身を含む): 47900160

約数和(自身を除く): 27119720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12671, 25342, 50684, 63355, 101368, 126710, 253420, 506840, 519511, 1039022, 2078044, 2597555, 4156088, 5195110, 10390220, 20780440]

約数ペア:

[(1, 20780440), (2, 10390220), (4, 5195110), (5, 4156088), (8, 2597555), (10, 2078044), (20, 1039022), (40, 519511), (41, 506840), (82, 253420), (164, 126710), (205, 101368), (328, 63355), (410, 50684), (820, 25342), (1640, 12671)]