19997908

素因数分解:

$2^2\times 7^1\times {\mathrm{37}}^1\times {\mathrm{97}}^1\times {\mathrm{199}}^1$

素因数の和:344

約数の個数: 48

約数和(自身を含む): 41708800

約数和(自身を除く): 21710892

約数列:

[1, 2, 4, 7, 14, 28, 37, 74, 97, 148, 194, 199, 259, 388, 398, 518, 679, 796, 1036, 1358, 1393, 2716, 2786, 3589, 5572, 7178, 7363, 14356, 14726, 19303, 25123, 29452, 38606, 50246, 51541, 77212, 100492, 103082, 135121, 206164, 270242, 540484, 714211, 1428422, 2856844, 4999477, 9998954, 19997908]

約数ペア:

[(1, 19997908), (2, 9998954), (4, 4999477), (7, 2856844), (14, 1428422), (28, 714211), (37, 540484), (74, 270242), (97, 206164), (148, 135121), (194, 103082), (199, 100492), (259, 77212), (388, 51541), (398, 50246), (518, 38606), (679, 29452), (796, 25123), (1036, 19303), (1358, 14726), (1393, 14356), (2716, 7363), (2786, 7178), (3589, 5572)]