20639871

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{401}}^1$

素因数の和:476

約数の個数: 48

約数和(自身を含む): 36791040

約数和(自身を除く): 16151169

約数列:

[1, 3, 7, 9, 19, 21, 43, 57, 63, 129, 133, 171, 301, 387, 399, 401, 817, 903, 1197, 1203, 2451, 2709, 2807, 3609, 5719, 7353, 7619, 8421, 17157, 17243, 22857, 25263, 51471, 51729, 53333, 68571, 120701, 155187, 159999, 327617, 362103, 479997, 982851, 1086309, 2293319, 2948553, 6879957, 20639871]

約数ペア:

[(1, 20639871), (3, 6879957), (7, 2948553), (9, 2293319), (19, 1086309), (21, 982851), (43, 479997), (57, 362103), (63, 327617), (129, 159999), (133, 155187), (171, 120701), (301, 68571), (387, 53333), (399, 51729), (401, 51471), (817, 25263), (903, 22857), (1197, 17243), (1203, 17157), (2451, 8421), (2709, 7619), (2807, 7353), (3609, 5719)]