20705440

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{139}}^1$

素因数の和:187

約数の個数: 144

約数和(自身を含む): 60328800

約数和(自身を除く): 39623360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 19, 20, 28, 32, 35, 38, 40, 49, 56, 70, 76, 80, 95, 98, 112, 133, 139, 140, 152, 160, 190, 196, 224, 245, 266, 278, 280, 304, 380, 392, 490, 532, 556, 560, 608, 665, 695, 760, 784, 931, 973, 980, 1064, 1112, 1120, 1330, 1390, 1520, 1568, 1862, 1946, 1960, 2128, 2224, 2641, 2660, 2780, 3040, 3724, 3892, 3920, 4256, 4448, 4655, 4865, 5282, 5320, 5560, 6811, 7448, 7784, 7840, 9310, 9730, 10564, 10640, 11120, 13205, 13622, 14896, 15568, 18487, 18620, 19460, 21128, 21280, 22240, 26410, 27244, 29792, 31136, 34055, 36974, 37240, 38920, 42256, 52820, 54488, 68110, 73948, 74480, 77840, 84512, 92435, 105640, 108976, 129409, 136220, 147896, 148960, 155680, 184870, 211280, 217952, 258818, 272440, 295792, 369740, 422560, 517636, 544880, 591584, 647045, 739480, 1035272, 1089760, 1294090, 1478960, 2070544, 2588180, 2957920, 4141088, 5176360, 10352720, 20705440]

約数ペア:

[(1, 20705440), (2, 10352720), (4, 5176360), (5, 4141088), (7, 2957920), (8, 2588180), (10, 2070544), (14, 1478960), (16, 1294090), (19, 1089760), (20, 1035272), (28, 739480), (32, 647045), (35, 591584), (38, 544880), (40, 517636), (49, 422560), (56, 369740), (70, 295792), (76, 272440), (80, 258818), (95, 217952), (98, 211280), (112, 184870), (133, 155680), (139, 148960), (140, 147896), (152, 136220), (160, 129409), (190, 108976), (196, 105640), (224, 92435), (245, 84512), (266, 77840), (278, 74480), (280, 73948), (304, 68110), (380, 54488), (392, 52820), (490, 42256), (532, 38920), (556, 37240), (560, 36974), (608, 34055), (665, 31136), (695, 29792), (760, 27244), (784, 26410), (931, 22240), (973, 21280), (980, 21128), (1064, 19460), (1112, 18620), (1120, 18487), (1330, 15568), (1390, 14896), (1520, 13622), (1568, 13205), (1862, 11120), (1946, 10640), (1960, 10564), (2128, 9730), (2224, 9310), (2641, 7840), (2660, 7784), (2780, 7448), (3040, 6811), (3724, 5560), (3892, 5320), (3920, 5282), (4256, 4865), (4448, 4655)]