21168040

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{397}}^1$

素因数の和:482

約数の個数: 64

約数和(自身を含む): 50434560

約数和(自身を除く): 29266520

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 43, 62, 86, 124, 155, 172, 215, 248, 310, 344, 397, 430, 620, 794, 860, 1240, 1333, 1588, 1720, 1985, 2666, 3176, 3970, 5332, 6665, 7940, 10664, 12307, 13330, 15880, 17071, 24614, 26660, 34142, 49228, 53320, 61535, 68284, 85355, 98456, 123070, 136568, 170710, 246140, 341420, 492280, 529201, 682840, 1058402, 2116804, 2646005, 4233608, 5292010, 10584020, 21168040]

約数ペア:

[(1, 21168040), (2, 10584020), (4, 5292010), (5, 4233608), (8, 2646005), (10, 2116804), (20, 1058402), (31, 682840), (40, 529201), (43, 492280), (62, 341420), (86, 246140), (124, 170710), (155, 136568), (172, 123070), (215, 98456), (248, 85355), (310, 68284), (344, 61535), (397, 53320), (430, 49228), (620, 34142), (794, 26660), (860, 24614), (1240, 17071), (1333, 15880), (1588, 13330), (1720, 12307), (1985, 10664), (2666, 7940), (3176, 6665), (3970, 5332)]