21978747

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{127}}^1$

素因数の和:248

約数の個数: 48

約数和(自身を含む): 38019072

約数和(自身を除く): 16040325

約数列:

[1, 3, 7, 9, 21, 41, 63, 67, 123, 127, 201, 287, 369, 381, 469, 603, 861, 889, 1143, 1407, 2583, 2667, 2747, 4221, 5207, 8001, 8241, 8509, 15621, 19229, 24723, 25527, 36449, 46863, 57687, 59563, 76581, 109347, 173061, 178689, 328041, 348869, 536067, 1046607, 2442083, 3139821, 7326249, 21978747]

約数ペア:

[(1, 21978747), (3, 7326249), (7, 3139821), (9, 2442083), (21, 1046607), (41, 536067), (63, 348869), (67, 328041), (123, 178689), (127, 173061), (201, 109347), (287, 76581), (369, 59563), (381, 57687), (469, 46863), (603, 36449), (861, 25527), (889, 24723), (1143, 19229), (1407, 15621), (2583, 8509), (2667, 8241), (2747, 8001), (4221, 5207)]