21391245

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{127}}^1\times {\mathrm{197}}^1$

素因数の和:354

約数の個数: 48

約数和(自身を含む): 39536640

約数和(自身を除く): 18145395

約数列:

[1, 3, 5, 9, 15, 19, 45, 57, 95, 127, 171, 197, 285, 381, 591, 635, 855, 985, 1143, 1773, 1905, 2413, 2955, 3743, 5715, 7239, 8865, 11229, 12065, 18715, 21717, 25019, 33687, 36195, 56145, 75057, 108585, 125095, 168435, 225171, 375285, 475361, 1125855, 1426083, 2376805, 4278249, 7130415, 21391245]

約数ペア:

[(1, 21391245), (3, 7130415), (5, 4278249), (9, 2376805), (15, 1426083), (19, 1125855), (45, 475361), (57, 375285), (95, 225171), (127, 168435), (171, 125095), (197, 108585), (285, 75057), (381, 56145), (591, 36195), (635, 33687), (855, 25019), (985, 21717), (1143, 18715), (1773, 12065), (1905, 11229), (2413, 8865), (2955, 7239), (3743, 5715)]