20945680

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{113}}^1\times {\mathrm{331}}^1$

素因数の和:464

約数の個数: 80

約数和(自身を含む): 56317824

約数和(自身を除く): 35372144

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 113, 140, 226, 280, 331, 452, 560, 565, 662, 791, 904, 1130, 1324, 1582, 1655, 1808, 2260, 2317, 2648, 3164, 3310, 3955, 4520, 4634, 5296, 6328, 6620, 7910, 9040, 9268, 11585, 12656, 13240, 15820, 18536, 23170, 26480, 31640, 37072, 37403, 46340, 63280, 74806, 92680, 149612, 185360, 187015, 261821, 299224, 374030, 523642, 598448, 748060, 1047284, 1309105, 1496120, 2094568, 2618210, 2992240, 4189136, 5236420, 10472840, 20945680]

約数ペア:

[(1, 20945680), (2, 10472840), (4, 5236420), (5, 4189136), (7, 2992240), (8, 2618210), (10, 2094568), (14, 1496120), (16, 1309105), (20, 1047284), (28, 748060), (35, 598448), (40, 523642), (56, 374030), (70, 299224), (80, 261821), (112, 187015), (113, 185360), (140, 149612), (226, 92680), (280, 74806), (331, 63280), (452, 46340), (560, 37403), (565, 37072), (662, 31640), (791, 26480), (904, 23170), (1130, 18536), (1324, 15820), (1582, 13240), (1655, 12656), (1808, 11585), (2260, 9268), (2317, 9040), (2648, 7910), (3164, 6620), (3310, 6328), (3955, 5296), (4520, 4634)]