21206840

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{193}}^1$

素因数の和:312

約数の個数: 64

約数和(自身を含む): 49865760

約数和(自身を除く): 28658920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 67, 82, 134, 164, 193, 205, 268, 328, 335, 386, 410, 536, 670, 772, 820, 965, 1340, 1544, 1640, 1930, 2680, 2747, 3860, 5494, 7720, 7913, 10988, 12931, 13735, 15826, 21976, 25862, 27470, 31652, 39565, 51724, 54940, 63304, 64655, 79130, 103448, 109880, 129310, 158260, 258620, 316520, 517240, 530171, 1060342, 2120684, 2650855, 4241368, 5301710, 10603420, 21206840]

約数ペア:

[(1, 21206840), (2, 10603420), (4, 5301710), (5, 4241368), (8, 2650855), (10, 2120684), (20, 1060342), (40, 530171), (41, 517240), (67, 316520), (82, 258620), (134, 158260), (164, 129310), (193, 109880), (205, 103448), (268, 79130), (328, 64655), (335, 63304), (386, 54940), (410, 51724), (536, 39565), (670, 31652), (772, 27470), (820, 25862), (965, 21976), (1340, 15826), (1544, 13735), (1640, 12931), (1930, 10988), (2680, 7913), (2747, 7720), (3860, 5494)]