21454520

素因数分解:

$2^3\times 5^1\times {\mathrm{647}}^1\times {\mathrm{829}}^1$

素因数の和:1487

約数の個数: 32

約数和(自身を含む): 48405600

約数和(自身を除く): 26951080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 647, 829, 1294, 1658, 2588, 3235, 3316, 4145, 5176, 6470, 6632, 8290, 12940, 16580, 25880, 33160, 536363, 1072726, 2145452, 2681815, 4290904, 5363630, 10727260, 21454520]

約数ペア:

[(1, 21454520), (2, 10727260), (4, 5363630), (5, 4290904), (8, 2681815), (10, 2145452), (20, 1072726), (40, 536363), (647, 33160), (829, 25880), (1294, 16580), (1658, 12940), (2588, 8290), (3235, 6632), (3316, 6470), (4145, 5176)]