21157227

素因数分解:

$3^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{109}}^1$

素因数の和:217

約数の個数: 64

約数和(自身を含む): 39424000

約数和(自身を除く): 18266773

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 63, 79, 91, 109, 117, 189, 237, 273, 327, 351, 553, 711, 763, 819, 981, 1027, 1417, 1659, 2133, 2289, 2457, 2943, 3081, 4251, 4977, 6867, 7189, 8611, 9243, 9919, 12753, 14931, 20601, 21567, 25833, 27729, 29757, 38259, 60277, 64701, 77499, 89271, 111943, 180831, 194103, 232497, 267813, 335829, 542493, 783601, 1007487, 1627479, 2350803, 3022461, 7052409, 21157227]

約数ペア:

[(1, 21157227), (3, 7052409), (7, 3022461), (9, 2350803), (13, 1627479), (21, 1007487), (27, 783601), (39, 542493), (63, 335829), (79, 267813), (91, 232497), (109, 194103), (117, 180831), (189, 111943), (237, 89271), (273, 77499), (327, 64701), (351, 60277), (553, 38259), (711, 29757), (763, 27729), (819, 25833), (981, 21567), (1027, 20601), (1417, 14931), (1659, 12753), (2133, 9919), (2289, 9243), (2457, 8611), (2943, 7189), (3081, 6867), (4251, 4977)]