21911820

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{257}}^1$

素因数の和:312

約数の個数: 144

約数和(自身を含む): 74118240

約数和(自身を除く): 52206420

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 29, 30, 35, 42, 49, 58, 60, 70, 84, 87, 98, 105, 116, 140, 145, 147, 174, 196, 203, 210, 245, 257, 290, 294, 348, 406, 420, 435, 490, 514, 580, 588, 609, 735, 771, 812, 870, 980, 1015, 1028, 1218, 1285, 1421, 1470, 1542, 1740, 1799, 2030, 2436, 2570, 2842, 2940, 3045, 3084, 3598, 3855, 4060, 4263, 5140, 5397, 5684, 6090, 7105, 7196, 7453, 7710, 8526, 8995, 10794, 12180, 12593, 14210, 14906, 15420, 17052, 17990, 21315, 21588, 22359, 25186, 26985, 28420, 29812, 35980, 37265, 37779, 42630, 44718, 50372, 52171, 53970, 62965, 74530, 75558, 85260, 89436, 104342, 107940, 111795, 125930, 149060, 151116, 156513, 188895, 208684, 223590, 251860, 260855, 313026, 365197, 377790, 447180, 521710, 626052, 730394, 755580, 782565, 1043420, 1095591, 1460788, 1565130, 1825985, 2191182, 3130260, 3651970, 4382364, 5477955, 7303940, 10955910, 21911820]

約数ペア:

[(1, 21911820), (2, 10955910), (3, 7303940), (4, 5477955), (5, 4382364), (6, 3651970), (7, 3130260), (10, 2191182), (12, 1825985), (14, 1565130), (15, 1460788), (20, 1095591), (21, 1043420), (28, 782565), (29, 755580), (30, 730394), (35, 626052), (42, 521710), (49, 447180), (58, 377790), (60, 365197), (70, 313026), (84, 260855), (87, 251860), (98, 223590), (105, 208684), (116, 188895), (140, 156513), (145, 151116), (147, 149060), (174, 125930), (196, 111795), (203, 107940), (210, 104342), (245, 89436), (257, 85260), (290, 75558), (294, 74530), (348, 62965), (406, 53970), (420, 52171), (435, 50372), (490, 44718), (514, 42630), (580, 37779), (588, 37265), (609, 35980), (735, 29812), (771, 28420), (812, 26985), (870, 25186), (980, 22359), (1015, 21588), (1028, 21315), (1218, 17990), (1285, 17052), (1421, 15420), (1470, 14906), (1542, 14210), (1740, 12593), (1799, 12180), (2030, 10794), (2436, 8995), (2570, 8526), (2842, 7710), (2940, 7453), (3045, 7196), (3084, 7105), (3598, 6090), (3855, 5684), (4060, 5397), (4263, 5140)]