21401960

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{541}}^1$

素因数の和:618

約数の個数: 64

約数和(自身を含む): 51511680

約数和(自身を除く): 30109720

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 43, 46, 86, 92, 115, 172, 184, 215, 230, 344, 430, 460, 541, 860, 920, 989, 1082, 1720, 1978, 2164, 2705, 3956, 4328, 4945, 5410, 7912, 9890, 10820, 12443, 19780, 21640, 23263, 24886, 39560, 46526, 49772, 62215, 93052, 99544, 116315, 124430, 186104, 232630, 248860, 465260, 497720, 535049, 930520, 1070098, 2140196, 2675245, 4280392, 5350490, 10700980, 21401960]

約数ペア:

[(1, 21401960), (2, 10700980), (4, 5350490), (5, 4280392), (8, 2675245), (10, 2140196), (20, 1070098), (23, 930520), (40, 535049), (43, 497720), (46, 465260), (86, 248860), (92, 232630), (115, 186104), (172, 124430), (184, 116315), (215, 99544), (230, 93052), (344, 62215), (430, 49772), (460, 46526), (541, 39560), (860, 24886), (920, 23263), (989, 21640), (1082, 19780), (1720, 12443), (1978, 10820), (2164, 9890), (2705, 7912), (3956, 5410), (4328, 4945)]