20716540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1$

素因数の和:191

約数の個数: 96

約数和(自身を含む): 51226560

約数和(自身を除く): 30510020

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 43, 52, 65, 68, 85, 86, 109, 130, 170, 172, 215, 218, 221, 260, 340, 430, 436, 442, 545, 559, 731, 860, 884, 1090, 1105, 1118, 1417, 1462, 1853, 2180, 2210, 2236, 2795, 2834, 2924, 3655, 3706, 4420, 4687, 5590, 5668, 7085, 7310, 7412, 9265, 9374, 9503, 11180, 14170, 14620, 18530, 18748, 19006, 23435, 24089, 28340, 37060, 38012, 46870, 47515, 48178, 60931, 79679, 93740, 95030, 96356, 120445, 121862, 159358, 190060, 240890, 243724, 304655, 318716, 398395, 481780, 609310, 796790, 1035827, 1218620, 1593580, 2071654, 4143308, 5179135, 10358270, 20716540]

約数ペア:

[(1, 20716540), (2, 10358270), (4, 5179135), (5, 4143308), (10, 2071654), (13, 1593580), (17, 1218620), (20, 1035827), (26, 796790), (34, 609310), (43, 481780), (52, 398395), (65, 318716), (68, 304655), (85, 243724), (86, 240890), (109, 190060), (130, 159358), (170, 121862), (172, 120445), (215, 96356), (218, 95030), (221, 93740), (260, 79679), (340, 60931), (430, 48178), (436, 47515), (442, 46870), (545, 38012), (559, 37060), (731, 28340), (860, 24089), (884, 23435), (1090, 19006), (1105, 18748), (1118, 18530), (1417, 14620), (1462, 14170), (1853, 11180), (2180, 9503), (2210, 9374), (2236, 9265), (2795, 7412), (2834, 7310), (2924, 7085), (3655, 5668), (3706, 5590), (4420, 4687)]