21123915

素因数分解:

$3^1\times 5^1\times {\mathrm{19}}^2\times {\mathrm{47}}^1\times {\mathrm{83}}^1$

素因数の和:176

約数の個数: 48

約数和(自身を含む): 36868608

約数和(自身を除く): 15744693

約数列:

[1, 3, 5, 15, 19, 47, 57, 83, 95, 141, 235, 249, 285, 361, 415, 705, 893, 1083, 1245, 1577, 1805, 2679, 3901, 4465, 4731, 5415, 7885, 11703, 13395, 16967, 19505, 23655, 29963, 50901, 58515, 74119, 84835, 89889, 149815, 222357, 254505, 370595, 449445, 1111785, 1408261, 4224783, 7041305, 21123915]

約数ペア:

[(1, 21123915), (3, 7041305), (5, 4224783), (15, 1408261), (19, 1111785), (47, 449445), (57, 370595), (83, 254505), (95, 222357), (141, 149815), (235, 89889), (249, 84835), (285, 74119), (361, 58515), (415, 50901), (705, 29963), (893, 23655), (1083, 19505), (1245, 16967), (1577, 13395), (1805, 11703), (2679, 7885), (3901, 5415), (4465, 4731)]