21289720

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{317}}^1$

素因数の和:424

約数の個数: 64

約数和(自身を含む): 50829120

約数和(自身を除く): 29539400

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 73, 92, 115, 146, 184, 230, 292, 317, 365, 460, 584, 634, 730, 920, 1268, 1460, 1585, 1679, 2536, 2920, 3170, 3358, 6340, 6716, 7291, 8395, 12680, 13432, 14582, 16790, 23141, 29164, 33580, 36455, 46282, 58328, 67160, 72910, 92564, 115705, 145820, 185128, 231410, 291640, 462820, 532243, 925640, 1064486, 2128972, 2661215, 4257944, 5322430, 10644860, 21289720]

約数ペア:

[(1, 21289720), (2, 10644860), (4, 5322430), (5, 4257944), (8, 2661215), (10, 2128972), (20, 1064486), (23, 925640), (40, 532243), (46, 462820), (73, 291640), (92, 231410), (115, 185128), (146, 145820), (184, 115705), (230, 92564), (292, 72910), (317, 67160), (365, 58328), (460, 46282), (584, 36455), (634, 33580), (730, 29164), (920, 23141), (1268, 16790), (1460, 14582), (1585, 13432), (1679, 12680), (2536, 8395), (2920, 7291), (3170, 6716), (3358, 6340)]