20421560

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{383}}^1$

素因数の和:468

約数の個数: 64

約数和(自身を含む): 48660480

約数和(自身を除く): 28238920

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 43, 62, 86, 124, 155, 172, 215, 248, 310, 344, 383, 430, 620, 766, 860, 1240, 1333, 1532, 1720, 1915, 2666, 3064, 3830, 5332, 6665, 7660, 10664, 11873, 13330, 15320, 16469, 23746, 26660, 32938, 47492, 53320, 59365, 65876, 82345, 94984, 118730, 131752, 164690, 237460, 329380, 474920, 510539, 658760, 1021078, 2042156, 2552695, 4084312, 5105390, 10210780, 20421560]

約数ペア:

[(1, 20421560), (2, 10210780), (4, 5105390), (5, 4084312), (8, 2552695), (10, 2042156), (20, 1021078), (31, 658760), (40, 510539), (43, 474920), (62, 329380), (86, 237460), (124, 164690), (155, 131752), (172, 118730), (215, 94984), (248, 82345), (310, 65876), (344, 59365), (383, 53320), (430, 47492), (620, 32938), (766, 26660), (860, 23746), (1240, 16469), (1333, 15320), (1532, 13330), (1720, 11873), (1915, 10664), (2666, 7660), (3064, 6665), (3830, 5332)]