20987568

素因数分解:

$2^4\times 3^2\times 7^1\times {\mathrm{47}}^1\times {\mathrm{443}}^1$

素因数の和:511

約数の個数: 120

約数和(自身を含む): 68709888

約数和(自身を除く): 47722320

約数列:

[1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 16, 18, 21, 24, 28, 36, 42, 47, 48, 56, 63, 72, 84, 94, 112, 126, 141, 144, 168, 188, 252, 282, 329, 336, 376, 423, 443, 504, 564, 658, 752, 846, 886, 987, 1008, 1128, 1316, 1329, 1692, 1772, 1974, 2256, 2632, 2658, 2961, 3101, 3384, 3544, 3948, 3987, 5264, 5316, 5922, 6202, 6768, 7088, 7896, 7974, 9303, 10632, 11844, 12404, 15792, 15948, 18606, 20821, 21264, 23688, 24808, 27909, 31896, 37212, 41642, 47376, 49616, 55818, 62463, 63792, 74424, 83284, 111636, 124926, 145747, 148848, 166568, 187389, 223272, 249852, 291494, 333136, 374778, 437241, 446544, 499704, 582988, 749556, 874482, 999408, 1165976, 1311723, 1499112, 1748964, 2331952, 2623446, 2998224, 3497928, 5246892, 6995856, 10493784, 20987568]

約数ペア:

[(1, 20987568), (2, 10493784), (3, 6995856), (4, 5246892), (6, 3497928), (7, 2998224), (8, 2623446), (9, 2331952), (12, 1748964), (14, 1499112), (16, 1311723), (18, 1165976), (21, 999408), (24, 874482), (28, 749556), (36, 582988), (42, 499704), (47, 446544), (48, 437241), (56, 374778), (63, 333136), (72, 291494), (84, 249852), (94, 223272), (112, 187389), (126, 166568), (141, 148848), (144, 145747), (168, 124926), (188, 111636), (252, 83284), (282, 74424), (329, 63792), (336, 62463), (376, 55818), (423, 49616), (443, 47376), (504, 41642), (564, 37212), (658, 31896), (752, 27909), (846, 24808), (886, 23688), (987, 21264), (1008, 20821), (1128, 18606), (1316, 15948), (1329, 15792), (1692, 12404), (1772, 11844), (1974, 10632), (2256, 9303), (2632, 7974), (2658, 7896), (2961, 7088), (3101, 6768), (3384, 6202), (3544, 5922), (3948, 5316), (3987, 5264)]