21357808

素因数分解:

$2^4\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{277}}^1$

素因数の和:425

約数の個数: 40

約数和(自身を含む): 42745280

約数和(自身を除く): 21387472

約数列:

[1, 2, 4, 8, 16, 61, 79, 122, 158, 244, 277, 316, 488, 554, 632, 976, 1108, 1264, 2216, 4432, 4819, 9638, 16897, 19276, 21883, 33794, 38552, 43766, 67588, 77104, 87532, 135176, 175064, 270352, 350128, 1334863, 2669726, 5339452, 10678904, 21357808]

約数ペア:

[(1, 21357808), (2, 10678904), (4, 5339452), (8, 2669726), (16, 1334863), (61, 350128), (79, 270352), (122, 175064), (158, 135176), (244, 87532), (277, 77104), (316, 67588), (488, 43766), (554, 38552), (632, 33794), (976, 21883), (1108, 19276), (1264, 16897), (2216, 9638), (4432, 4819)]