28878213

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 48721920

約数和(自身を除く): 19843707

約数列:

[1, 3, 7, 13, 21, 39, 79, 91, 103, 169, 237, 273, 309, 507, 553, 721, 1027, 1183, 1339, 1659, 2163, 3081, 3549, 4017, 7189, 8137, 9373, 13351, 17407, 21567, 24411, 28119, 40053, 52221, 56959, 93457, 105781, 121849, 170877, 280371, 317343, 365547, 740467, 1375153, 2221401, 4125459, 9626071, 28878213]

約数ペア:

[(1, 28878213), (3, 9626071), (7, 4125459), (13, 2221401), (21, 1375153), (39, 740467), (79, 365547), (91, 317343), (103, 280371), (169, 170877), (237, 121849), (273, 105781), (309, 93457), (507, 56959), (553, 52221), (721, 40053), (1027, 28119), (1183, 24411), (1339, 21567), (1659, 17407), (2163, 13351), (3081, 9373), (3549, 8137), (4017, 7189)]