21221360

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{199}}^1$

素因数の和:286

約数の個数: 80

約数和(自身を含む): 52377600

約数和(自身を除く): 31156240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 43, 62, 80, 86, 124, 155, 172, 199, 215, 248, 310, 344, 398, 430, 496, 620, 688, 796, 860, 995, 1240, 1333, 1592, 1720, 1990, 2480, 2666, 3184, 3440, 3980, 5332, 6169, 6665, 7960, 8557, 10664, 12338, 13330, 15920, 17114, 21328, 24676, 26660, 30845, 34228, 42785, 49352, 53320, 61690, 68456, 85570, 98704, 106640, 123380, 136912, 171140, 246760, 265267, 342280, 493520, 530534, 684560, 1061068, 1326335, 2122136, 2652670, 4244272, 5305340, 10610680, 21221360]

約数ペア:

[(1, 21221360), (2, 10610680), (4, 5305340), (5, 4244272), (8, 2652670), (10, 2122136), (16, 1326335), (20, 1061068), (31, 684560), (40, 530534), (43, 493520), (62, 342280), (80, 265267), (86, 246760), (124, 171140), (155, 136912), (172, 123380), (199, 106640), (215, 98704), (248, 85570), (310, 68456), (344, 61690), (398, 53320), (430, 49352), (496, 42785), (620, 34228), (688, 30845), (796, 26660), (860, 24676), (995, 21328), (1240, 17114), (1333, 15920), (1592, 13330), (1720, 12338), (1990, 10664), (2480, 8557), (2666, 7960), (3184, 6665), (3440, 6169), (3980, 5332)]