21739940

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{1487}}^1$

素因数の和:1556

約数の個数: 48

約数和(自身を含む): 49496832

約数和(自身を除く): 27756892

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 43, 68, 85, 86, 170, 172, 215, 340, 430, 731, 860, 1462, 1487, 2924, 2974, 3655, 5948, 7310, 7435, 14620, 14870, 25279, 29740, 50558, 63941, 101116, 126395, 127882, 252790, 255764, 319705, 505580, 639410, 1086997, 1278820, 2173994, 4347988, 5434985, 10869970, 21739940]

約数ペア:

[(1, 21739940), (2, 10869970), (4, 5434985), (5, 4347988), (10, 2173994), (17, 1278820), (20, 1086997), (34, 639410), (43, 505580), (68, 319705), (85, 255764), (86, 252790), (170, 127882), (172, 126395), (215, 101116), (340, 63941), (430, 50558), (731, 29740), (860, 25279), (1462, 14870), (1487, 14620), (2924, 7435), (2974, 7310), (3655, 5948)]