20904380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{83}}^1\times {\mathrm{257}}^1$

素因数の和:363

約数の個数: 72

約数和(自身を含む): 51882768

約数和(自身を除く): 30978388

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 83, 98, 140, 166, 196, 245, 257, 332, 415, 490, 514, 581, 830, 980, 1028, 1162, 1285, 1660, 1799, 2324, 2570, 2905, 3598, 4067, 5140, 5810, 7196, 8134, 8995, 11620, 12593, 16268, 17990, 20335, 21331, 25186, 35980, 40670, 42662, 50372, 62965, 81340, 85324, 106655, 125930, 149317, 213310, 251860, 298634, 426620, 597268, 746585, 1045219, 1493170, 2090438, 2986340, 4180876, 5226095, 10452190, 20904380]

約数ペア:

[(1, 20904380), (2, 10452190), (4, 5226095), (5, 4180876), (7, 2986340), (10, 2090438), (14, 1493170), (20, 1045219), (28, 746585), (35, 597268), (49, 426620), (70, 298634), (83, 251860), (98, 213310), (140, 149317), (166, 125930), (196, 106655), (245, 85324), (257, 81340), (332, 62965), (415, 50372), (490, 42662), (514, 40670), (581, 35980), (830, 25186), (980, 21331), (1028, 20335), (1162, 17990), (1285, 16268), (1660, 12593), (1799, 11620), (2324, 8995), (2570, 8134), (2905, 7196), (3598, 5810), (4067, 5140)]