21064840

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{331}}^1$

素因数の和:422

約数の個数: 64

約数和(自身を含む): 49959360

約数和(自身を除く): 28894520

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 43, 74, 86, 148, 172, 185, 215, 296, 331, 344, 370, 430, 662, 740, 860, 1324, 1480, 1591, 1655, 1720, 2648, 3182, 3310, 6364, 6620, 7955, 12247, 12728, 13240, 14233, 15910, 24494, 28466, 31820, 48988, 56932, 61235, 63640, 71165, 97976, 113864, 122470, 142330, 244940, 284660, 489880, 526621, 569320, 1053242, 2106484, 2633105, 4212968, 5266210, 10532420, 21064840]

約数ペア:

[(1, 21064840), (2, 10532420), (4, 5266210), (5, 4212968), (8, 2633105), (10, 2106484), (20, 1053242), (37, 569320), (40, 526621), (43, 489880), (74, 284660), (86, 244940), (148, 142330), (172, 122470), (185, 113864), (215, 97976), (296, 71165), (331, 63640), (344, 61235), (370, 56932), (430, 48988), (662, 31820), (740, 28466), (860, 24494), (1324, 15910), (1480, 14233), (1591, 13240), (1655, 12728), (1720, 12247), (2648, 7955), (3182, 6620), (3310, 6364)]