21507915

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{271}}^1$

素因数の和:340

約数の個数: 64

約数和(自身を含む): 41674752

約数和(自身を除く): 20166837

約数列:

[1, 3, 5, 11, 13, 15, 33, 37, 39, 55, 65, 111, 143, 165, 185, 195, 271, 407, 429, 481, 555, 715, 813, 1221, 1355, 1443, 2035, 2145, 2405, 2981, 3523, 4065, 5291, 6105, 7215, 8943, 10027, 10569, 14905, 15873, 17615, 26455, 30081, 38753, 44715, 50135, 52845, 79365, 110297, 116259, 130351, 150405, 193765, 330891, 391053, 551485, 581295, 651755, 1433861, 1654455, 1955265, 4301583, 7169305, 21507915]

約数ペア:

[(1, 21507915), (3, 7169305), (5, 4301583), (11, 1955265), (13, 1654455), (15, 1433861), (33, 651755), (37, 581295), (39, 551485), (55, 391053), (65, 330891), (111, 193765), (143, 150405), (165, 130351), (185, 116259), (195, 110297), (271, 79365), (407, 52845), (429, 50135), (481, 44715), (555, 38753), (715, 30081), (813, 26455), (1221, 17615), (1355, 15873), (1443, 14905), (2035, 10569), (2145, 10027), (2405, 8943), (2981, 7215), (3523, 6105), (4065, 5291)]