21681240

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{487}}^1$

素因数の和:561

約数の個数: 128

約数和(自身を含む): 75893760

約数和(自身を除く): 54212520

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 53, 56, 60, 70, 84, 105, 106, 120, 140, 159, 168, 210, 212, 265, 280, 318, 371, 420, 424, 487, 530, 636, 742, 795, 840, 974, 1060, 1113, 1272, 1461, 1484, 1590, 1855, 1948, 2120, 2226, 2435, 2922, 2968, 3180, 3409, 3710, 3896, 4452, 4870, 5565, 5844, 6360, 6818, 7305, 7420, 8904, 9740, 10227, 11130, 11688, 13636, 14610, 14840, 17045, 19480, 20454, 22260, 25811, 27272, 29220, 34090, 40908, 44520, 51135, 51622, 58440, 68180, 77433, 81816, 102270, 103244, 129055, 136360, 154866, 180677, 204540, 206488, 258110, 309732, 361354, 387165, 409080, 516220, 542031, 619464, 722708, 774330, 903385, 1032440, 1084062, 1445416, 1548660, 1806770, 2168124, 2710155, 3097320, 3613540, 4336248, 5420310, 7227080, 10840620, 21681240]

約数ペア:

[(1, 21681240), (2, 10840620), (3, 7227080), (4, 5420310), (5, 4336248), (6, 3613540), (7, 3097320), (8, 2710155), (10, 2168124), (12, 1806770), (14, 1548660), (15, 1445416), (20, 1084062), (21, 1032440), (24, 903385), (28, 774330), (30, 722708), (35, 619464), (40, 542031), (42, 516220), (53, 409080), (56, 387165), (60, 361354), (70, 309732), (84, 258110), (105, 206488), (106, 204540), (120, 180677), (140, 154866), (159, 136360), (168, 129055), (210, 103244), (212, 102270), (265, 81816), (280, 77433), (318, 68180), (371, 58440), (420, 51622), (424, 51135), (487, 44520), (530, 40908), (636, 34090), (742, 29220), (795, 27272), (840, 25811), (974, 22260), (1060, 20454), (1113, 19480), (1272, 17045), (1461, 14840), (1484, 14610), (1590, 13636), (1855, 11688), (1948, 11130), (2120, 10227), (2226, 9740), (2435, 8904), (2922, 7420), (2968, 7305), (3180, 6818), (3409, 6360), (3710, 5844), (3896, 5565), (4452, 4870)]