21047117

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:130

約数の個数: 48

約数和(自身を含む): 29111040

約数和(自身を除く): 8063923

約数列:

[1, 7, 13, 19, 37, 47, 49, 91, 133, 247, 259, 329, 481, 611, 637, 703, 893, 931, 1729, 1739, 1813, 2303, 3367, 4277, 4921, 6251, 9139, 11609, 12103, 12173, 22607, 23569, 29939, 33041, 34447, 43757, 63973, 81263, 85211, 158249, 231287, 429533, 447811, 568841, 1107743, 1619009, 3006731, 21047117]

約数ペア:

[(1, 21047117), (7, 3006731), (13, 1619009), (19, 1107743), (37, 568841), (47, 447811), (49, 429533), (91, 231287), (133, 158249), (247, 85211), (259, 81263), (329, 63973), (481, 43757), (611, 34447), (637, 33041), (703, 29939), (893, 23569), (931, 22607), (1729, 12173), (1739, 12103), (1813, 11609), (2303, 9139), (3367, 6251), (4277, 4921)]