21155823

素因数分解:

$3^5\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{181}}^1$

素因数の和:246

約数の個数: 48

約数和(自身を含む): 35243936

約数和(自身を除く): 14088113

約数列:

[1, 3, 9, 13, 27, 37, 39, 81, 111, 117, 181, 243, 333, 351, 481, 543, 999, 1053, 1443, 1629, 2353, 2997, 3159, 4329, 4887, 6697, 7059, 8991, 12987, 14661, 20091, 21177, 38961, 43983, 60273, 63531, 87061, 116883, 180819, 190593, 261183, 542457, 571779, 783549, 1627371, 2350647, 7051941, 21155823]

約数ペア:

[(1, 21155823), (3, 7051941), (9, 2350647), (13, 1627371), (27, 783549), (37, 571779), (39, 542457), (81, 261183), (111, 190593), (117, 180819), (181, 116883), (243, 87061), (333, 63531), (351, 60273), (481, 43983), (543, 38961), (999, 21177), (1053, 20091), (1443, 14661), (1629, 12987), (2353, 8991), (2997, 7059), (3159, 6697), (4329, 4887)]