20812216

素因数分解:

$2^3\times {\mathrm{17}}^1\times {\mathrm{199}}^1\times {\mathrm{769}}^1$

素因数の和:991

約数の個数: 32

約数和(自身を含む): 41580000

約数和(自身を除く): 20767784

約数列:

[1, 2, 4, 8, 17, 34, 68, 136, 199, 398, 769, 796, 1538, 1592, 3076, 3383, 6152, 6766, 13073, 13532, 26146, 27064, 52292, 104584, 153031, 306062, 612124, 1224248, 2601527, 5203054, 10406108, 20812216]

約数ペア:

[(1, 20812216), (2, 10406108), (4, 5203054), (8, 2601527), (17, 1224248), (34, 612124), (68, 306062), (136, 153031), (199, 104584), (398, 52292), (769, 27064), (796, 26146), (1538, 13532), (1592, 13073), (3076, 6766), (3383, 6152)]