21381320

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{401}}^1$

素因数の和:486

約数の個数: 64

約数和(自身を含む): 50941440

約数和(自身を除く): 29560120

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 43, 62, 86, 124, 155, 172, 215, 248, 310, 344, 401, 430, 620, 802, 860, 1240, 1333, 1604, 1720, 2005, 2666, 3208, 4010, 5332, 6665, 8020, 10664, 12431, 13330, 16040, 17243, 24862, 26660, 34486, 49724, 53320, 62155, 68972, 86215, 99448, 124310, 137944, 172430, 248620, 344860, 497240, 534533, 689720, 1069066, 2138132, 2672665, 4276264, 5345330, 10690660, 21381320]

約数ペア:

[(1, 21381320), (2, 10690660), (4, 5345330), (5, 4276264), (8, 2672665), (10, 2138132), (20, 1069066), (31, 689720), (40, 534533), (43, 497240), (62, 344860), (86, 248620), (124, 172430), (155, 137944), (172, 124310), (215, 99448), (248, 86215), (310, 68972), (344, 62155), (401, 53320), (430, 49724), (620, 34486), (802, 26660), (860, 24862), (1240, 17243), (1333, 16040), (1604, 13330), (1720, 12431), (2005, 10664), (2666, 8020), (3208, 6665), (4010, 5332)]